Rolex Milgauss Guide: History, References, Dials and Prices

The Rolex Milgauss is the 40 mm Oystersteel watch Rolex built for scientists and engineers who work near strong magnetic fields: a soft-iron inner shield lets it keep time in fields of up to 1,000 gauss, which is where the name comes from. The modern reference 116400 ran from 2007 until Rolex removed it from the catalogue at Watches and Wonders in 2023 without naming a successor, and it is now bought only on the secondary market. This guide covers what the antimagnetic shield does, the history from the 6541 of 1956 through the 1019 to the 2007 return, every modern dial and crystal combination including the green-crystal 116400GV and the Z-Blue dial of 2014, the calibre 3131, why the model was discontinued and what that did to prices, how it compares with the Explorer 40 and the Oyster Perpetual 41 as the current alternatives, and what to check before buying. Bizak & Co. sources the Milgauss to order; the Milgauss collection lists the configurations we can seek.

Last reviewed on October 7, 2026 by Filip Biczak. Prices are dated observations, not quotes.

What is the Rolex Milgauss and what does 1,000 gauss mean?

A mechanical watch keeps time with a hairspring, a coil of metal that breathes in and out several times a second. Expose a conventional steel hairspring to a magnet and its coils can stick together, which shortens the spring and makes the watch run fast, sometimes by minutes a day. In the 1950s that was a real problem for people working around early particle accelerators, power stations, medical equipment and radar installations. Rolex's answer was to enclose the movement in a second case made of a ferromagnetic alloy, a Faraday cage in effect, that diverts magnetic flux around the movement rather than through it. The name is a contraction of the French mille, meaning thousand, and gauss, the unit of magnetic flux density: the watch was rated to resist a field of 1,000 gauss, many times what an ordinary watch of the period could tolerate. The shield is the reason the Milgauss is thicker than other time-only Rolex watches and the reason it has no date, since a date window would require an aperture in the dial side of the shield. On the modern reference the shield carries a stylised B with an arrow above it, the physics symbol for magnetic flux density, visible only with the case back removed.

Rolex Milgauss history: 6541, 1019 and the 2007 return

Rolex introduced the Milgauss in 1956 as reference 6541, following a short earlier run catalogued as 6543. The 6541 was a 38 mm watch with a rotating bezel, a dial with a honeycomb texture and a seconds hand shaped like a lightning bolt, and it was tested by scientists at CERN, the European particle physics laboratory outside Geneva, which gave Rolex its most durable piece of marketing for the model. The 6541 is rare today and sits among the most valuable steel Rolex sports watches at auction; it is also heavily faked and rebuilt, so any example needs specialist review.

In 1960 the 1019 replaced it and stayed in the catalogue for nearly three decades. The 1019 dropped the rotating bezel for a smooth one and replaced the lightning hand with a straight seconds hand, so it looks like a plain Oyster Perpetual with a wider case. It sold slowly, and by the time Rolex retired it in 1988 the model had a small following and little commercial pull. Rolex then left the name unused for nearly twenty years.

The return came at Baselworld in 2007. Reference 116400 brought the case up to 40 mm, brought back the lightning-bolt seconds hand in orange, kept the smooth polished bezel of the 1019 and added a new in-house movement, the calibre 3131, with parts designed to shrug off magnetism on their own. Rolex offered two dials, white and black, under a conventional clear sapphire crystal, and a third version, the 116400GV, with a black dial under a green-tinted sapphire crystal. GV stands for glace verte, French for green glass; Rolex described the tinted sapphire at launch as exceptionally difficult to produce. In 2014 Rolex added a fourth version, a 116400GV with a metallic blue dial it called Z-Blue, under the same green crystal. The 116400 ran for 16 years and was removed from the catalogue in March 2023.

Rolex Milgauss 116400 specifications

Source: the Milgauss no longer appears on the Rolex watches collection page, which is the simplest confirmation that the model has left the current range; the Rolex watch care and service page describes the servicing programme that still covers it. Rolex's Superlative Chronometer standard is tighter than the chronometer certification issued by the Contrôle Officiel Suisse des Chronomètres, which tested every calibre 3131 before Rolex applied its own tests to the cased watch.

Which Milgauss references and dials exist?

The modern references are easy to confuse because the 116400 and 116400GV share the same case, movement and bracelet; the only difference is the tint of the crystal and, for the Z-Blue, the dial. Rolex pared the line back over time: the white dial left the catalogue in the mid-2010s, the black dial under a clear crystal followed, and by the final years only the two green-crystal versions were listed. That is why most examples offered today are a 116400GV in black or Z-Blue, and why a clean white-dial 116400 is becoming the scarce one.

Why does the Milgauss have a lightning-bolt seconds hand and a green crystal?

The lightning bolt is the 6541's signature and the detail that gives the watch its character. On the 116400 it is orange, slightly too long for the dial so that its tip reaches the minute track, and it is the only Rolex hand shaped like anything other than a baton or a Mercedes. The orange carries to the Milgauss name on the dial and to the minute markers, which on the black and Z-Blue dials gives a watch that is sober from across a room and playful from a foot away.

The green crystal is harder to explain and harder to make. Rolex tints the sapphire itself rather than applying a coating, so the colour cannot wear off and does not show as a film. In most light the tint reads as a faint green edge around the dial opening; in direct sunlight, held at an angle, the whole crystal flashes green. It is not a filter, and the dial behind it reads as black or blue, not green. Because the sapphire is tinted in the material, a replacement crystal must come from Rolex, which is one of the service points covered below. The Z-Blue dial was designed for that crystal: the metallic blue picks up the green tint at the edges and the orange hand sits on top, which is why the combination has become the Milgauss most people ask for.

What is the Rolex calibre 3131?

The calibre 3131 is a time-only self-winding movement from the Rolex 3100 family, the same base as the 3130 used in the Submariner no-date and the Explorer of the period. What sets it apart is the pair of components designed for the Milgauss. The hairspring is Rolex's blue Parachrom, an alloy of niobium and zirconium that is insensitive to magnetic fields and more resistant to shocks than a conventional spring. The escape wheel is made of a nickel-phosphorus alloy produced by an electroforming process, again chosen because it is paramagnetic. Together with the soft-iron shield, these give the watch its rating. The 3131 runs at 28,800 vibrations an hour and stores about 48 hours of power, which is the one specification that dates it: Rolex's current 3230 and 3235 calibres run for about 70 hours. Every 3131 was certified by COSC and then tested by Rolex to its own Superlative Chronometer standard, which from 2015 meant a tolerance of plus or minus 2 seconds a day on the cased watch. Rolex still services the calibre, and the Rolex watch care and service page explains the programme; a full Rolex service typically returns the movement to its factory tolerance and replaces the gaskets that keep the 100 m rating honest.

Why was the Rolex Milgauss discontinued and what happened to prices?

Rolex removed the Milgauss from its catalogue in March 2023, at the Watches and Wonders fair in Geneva, with no announcement and no replacement. The company does not explain discontinuations, so any reason is inference, but the most persuasive one is that the Milgauss had been overtaken by Rolex's own technology. The Parachrom hairspring and paramagnetic escapement that the Milgauss introduced are now in every current Rolex calibre, and the newer 3200-series movements with the Chronergy escapement add a 70-hour reserve the 3131 could not match. A dedicated antimagnetic watch with a shorter power reserve and an extra 2 mm of thickness no longer had a technical argument inside Rolex's own range. The Milgauss had also been one of the slower sellers at authorised dealers for most of its life, which is why it was one of the few steel professional models a walk-in customer could still buy at retail in the early 2020s.

The effect on the secondary market was immediate. In the weeks after the announcement, asking prices for unworn and full-set examples rose well above the last retail price, with the Z-Blue leading, and dealers reported the Milgauss going from a watch they had to work to sell to one they could not keep. That spike eased through the rest of 2023 and 2024 as the first wave of buyers was satisfied and more examples came to market, but the floor settled well above where it had been before March 2023. By 2025 and 2026 the pattern was familiar from other discontinued Rolex models: a clear premium over the last retail price for green-crystal examples with box and card, a smaller premium for the clear-crystal dials, and a steady upward drift for complete, unpolished sets. Rolex's last US list price for the green-crystal versions sat around US$9,000 in 2023; our Rolex price guide explains how to read the gap between that figure and today's asks.

How much is a Rolex Milgauss? Bizak catalogue asks, October 7, 2026

On October 7, 2026, Bizak's sourced catalogue listed eight Milgauss entries, all sourced to order. The figures below are what we saw that day and will move with condition, year, set and demand; ask for a dated quote for the exact watch.

Three points stand out. First, unworn green-crystal examples were asked at roughly US$13,000, a clear step above the last retail price, which is the discontinuation premium in plain figures. Second, pre-owned clear-crystal and black-GV examples clustered just under US$10,000, so a buyer who wants the Milgauss rather than a specific dial can save a third by accepting wear and a 2010s card. Third, the two Z-Blue entries show the spread within one dial: US$13,055 brand new against US$15,714 for a pre-owned example, which reflects the second listing's set, year and source rather than any rule that pre-owned costs more; it is a reminder to compare quotes on the specific watch rather than the reference. The PVD/DLC-coated entry is a 116400 with a black coating that Rolex never offered from the factory; it suits a buyer who wants the look, but it has no place in a collection built on originality, and a non-factory coating can complicate a Rolex service. Our guide to selling a Rolex covers the other side of the same market if you already own one.

Milgauss vs Explorer 40 vs Oyster Perpetual 41: which to buy now?

The Explorer 40 arrived at the same 2023 fair that retired the Milgauss, and it is the closest thing Rolex makes to a replacement: 40 mm, steel, smooth bezel, no date, but with the 70-hour calibre 3230 and a thinner case. It is the rational choice and the one to buy if the antimagnetic story was never the point. The Oyster Perpetual 41 is the choice for colour: the 134300 dials give the same cheerfulness the Z-Blue gave the Milgauss, with the same movement as the Explorer and a lower entry price for the plain dials. The Milgauss remains the only one of the three with a lightning hand, a green crystal and a shield, and the only one whose production has ended, which is why its price runs above both current models. Our Explorer 40 224270 guide and Oyster Perpetual 41 guide go into each alternative in detail.

How does the Rolex Milgauss wear?

At 40 mm with a thickness of about 13 mm, the Milgauss wears larger than its diameter suggests. The smooth polished bezel is narrow, which leaves a wide dial opening, and the case sides are slab-like because the inner shield needs room, so the watch sits taller on the wrist than a Submariner of the same diameter and noticeably taller than an Explorer 40. The polished centre links on the Oyster bracelet add flash that the brushed-link professional models lack, and the Easylink extension gives 5 mm of adjustment without tools, which matters on a watch this heavy in summer. Wrists of about 17 cm (6.7 inches) and above carry it comfortably; below that the thickness, rather than the diameter, is what shows. There is no 36 mm Milgauss, no gold Milgauss and no bracelet option other than the Oyster, so the choice comes down to dial and crystal.

Buying a used Rolex Milgauss: what to check

• Crystal tint. A genuine 116400GV crystal is tinted through the sapphire, so the green shows at the edge and in reflections but never as a film on the surface. A clear crystal on a watch sold as a GV, or a green crystal that looks coated, is a replacement or a swap; the 116400 and 116400GV share every other part, so this is the one place a seller can upgrade a watch cheaply.
• Lightning hand. The orange seconds hand should be straight, its tip should reach the minute track and the orange should match the dial lettering. A bent or refinished hand points to amateur work inside the case.
• Bezel and case. The polished bezel and polished centre links show every scratch, and a heavy polish rounds the case edges and thins the lugs. Look for crisp transitions between the brushed lug tops and polished sides; a case that is uniformly bright has been refinished.
• Dial and lume. The white and black 116400 dials are two-tone white and orange; the Z-Blue is metallic and shifts with light. Check that luminous markers glow evenly and that the Milgauss lettering is sharp; redials are rare on this reference but swaps between the black and Z-Blue dials are not.
• Service history. The 3131 is robust but a watch from 2007 to 2012 is due at least one service by now. Ask for the Rolex service paper, check that the gaskets were replaced and that the case back was closed with the correct tool; a chewed case back is the usual sign of a non-specialist opening the watch.
• Warranty card and serial. The card serial should match the engraving on the rehaut; cards from 2007 to mid-2015 carried a two-year warranty and later ones five years, so an unworn 2022 watch may still be inside Rolex's cover. Rolex does not reissue cards.
• Magnetism. A Milgauss that runs fast by a minute or more a day has either been opened and had the shield left out or has a problem unrelated to magnetism; either way, do not buy it unseen.
• Price against the band. A full-set Z-Blue offered well under the October 2026 asks above is the single most reliable warning sign.

Our authentication process describes what we inspect before dispatch.

Is the Rolex Milgauss a good investment?

It has been a better one since 2023 than it was for the sixteen years before. The discontinuation turned a slow seller into a collectable, and the green-crystal versions, above all the Z-Blue, have held the premium that followed the announcement. The honest caveat is that this is already priced in: a buyer in October 2026 pays a discontinuation premium rather than earning one. Two things support the case from here. Rolex made the Milgauss in modest numbers compared with the Submariner or Datejust, and the share of surviving examples that are complete, unpolished and on their original crystal shrinks every year. Against that, the clear-crystal 116400 dials have appreciated more slowly, and the pre-owned asks under US$10,000 in our catalogue show that the market distinguishes sharply between a GV with box and card and a worn 2009 white dial. Buy the Milgauss because the lightning hand, the green crystal and the story are what you want; if resale is the point, buy a complete green-crystal set and keep it unpolished.

Quick answers

How much is a Rolex Milgauss?

On October 7, 2026, Bizak's sourced catalogue listed brand new 116400GV examples in black and Z-Blue at US$13,055, a brand new white-dial 116400 at US$11,794, pre-owned examples from US$9,552 to US$9,875, and a pre-owned Z-Blue at US$15,714, all sourced to order. Figures move with condition, year and set.

Is the Rolex Milgauss discontinued?

Yes. Rolex removed the Milgauss 116400 and 116400GV from its catalogue in March 2023 at Watches and Wonders and has not announced a successor, so every Milgauss is now bought on the secondary market.

What does Milgauss mean?

Mille gauss, French for a thousand gauss. A soft-iron shield around the movement and paramagnetic movement parts let the watch resist magnetic fields of up to 1,000 gauss, which ordinary mechanical watches of the 1950s could not.

What is the difference between the Milgauss 116400 and 116400GV?

The crystal. The 116400 has a clear sapphire over a white or black dial; the 116400GV has a green-tinted sapphire over a black or Z-Blue dial. Case, calibre 3131, bezel and bracelet are the same.

What replaced the Rolex Milgauss?

Nothing by name. The Explorer 40 224270, launched at the same 2023 fair, is the closest current Rolex: 40 mm, steel, smooth bezel, no date, with the 70-hour calibre 3230. The Oyster Perpetual 41 is the choice for a coloured dial.

Request a Rolex Milgauss sourcing quote

Tell us the dial and crystal you want, your preferred year range, condition and whether box and card are required, plus your budget and timing, through our sourcing enquiry form. We confirm the specific watch, photographs, card and final price before you commit. Catalogue entries: 116400GV black dial, 116400GV Z-Blue, 116400 white dial, pre-owned 116400GV, pre-owned 116400 black dial, pre-owned 116400 white dial, Explorer 40 224270; browse the Milgauss collection, the used Milgauss collection, the wider Rolex collection, or sell or trade your Milgauss.

Related reading: Explorer 40 224270 guide · Oyster Perpetual 41 guide · Rolex price guide · How to sell a Rolex.