Jaeger-LeCoultre Reverso One Duetto Q336247J Review

The Jaeger-LeCoultre Reverso One Duetto Q336247J is a 40 x 20mm rose gold dress watch with a diamond-set bezel and two dials, silver on one face and black on the other, that swap with a turn of the reversible case. It sits at the top of JLC's Reverso One family, the elongated, women's-proportioned branch of the Reverso line that JLC separated from the classic rectangular unisex Reverso Classic case. This guide covers the specifications, what the Reverso's reversible case and the Duetto's two dials are for, how the Q336247J compares with JLC's other Reverso One references, how it wears, price context in 2026 and what to check before buying. Bizak & Co. sources the Q336247J to order; the Jaeger-LeCoultre collection lists the configurations we can seek.

Last reviewed on September 28, 2026 by Filip Biczak. Prices are dated observations, not quotes.

Jaeger-LeCoultre Reverso One Duetto Q336247J specifications

Case and collection details checked against Jaeger-LeCoultre's published Reverso collection materials and cross-referenced with the Federation of the Swiss Watch Industry, the Swiss trade body that tracks the mechanical watchmaking sector the Reverso belongs to.

What is the Reverso, and what does Duetto mean?

Jaeger-LeCoultre launched the Reverso in 1931 to solve a specific problem reported by polo players in British India: a watch crystal that cracked under impact during matches. The solution, engineered with input from César de Trey and patented by René-Alfred Chauvot, was a case that slides and flips on its base, letting the wearer turn the dial to face the wrist and protect the crystal with the solid metal caseback instead. The name Reverso comes from the Latin for "I turn around," and the reversible case has remained the collection's defining feature for nearly a century, used today for decoration, engraving and, as here, a second dial rather than impact protection.

Duetto references were originally built so the reverse face carried a second, fully functional dial rather than a plain or engraved caseback, giving the watch two distinct looks depending on which face is shown. On the Q336247J that means a silver dial with its own hands and hour markers on one side and a black dial on the other, both housed in the same rose gold, diamond-set case. The Reverso One line itself is JLC's elongated, more oval branch of the collection, distinct from the classic rectangular Reverso Classic case that most closely follows the 1931 original, and it was developed specifically to suit smaller and women's wrist proportions.

Q336247J or JLC's other Reverso One references?

The Reverso One Cordonnet is the clearest illustration of how much the Duetto's second dial, diamond bezel, solid gold case and manual movement add over JLC's entry-level Reverso One: a smaller two-metal case, one dial and a quartz movement, at roughly an eighth of the Q336247J's catalogue ask. The Reverso Classic Small sits at a similar entry price point in the unisex rectangular case rather than the Reverso One's elongated shape. Buyers choosing among these are generally choosing between a jewellery-grade mechanical piece with two faces and an everyday quartz Reverso, not comparable alternatives at the same tier.

How does the Reverso One Duetto Q336247J wear?

At 40 x 20mm the Reverso One's elongated, more oval case sits differently on the wrist than the classic rectangular Reverso, generally reading as more jewellery-like and less architectural. Solid rose gold with a diamond-set bezel adds real weight and sparkle compared with the steel or two-metal Reverso One references, and the rose gold bracelet keeps the metal tone consistent from lug to clasp rather than mixing in leather or fabric. Because the case is reversible, the watch is thicker on the wrist than a fixed dress-watch case of the same footprint would be, which is the trade-off every Reverso owner accepts for the flip function. Flipping between the silver and black dials takes a deliberate two-handed motion rather than a quick flick, and the mechanism should move smoothly without grinding or catching; a stiff or loose slide is worth flagging before purchase.

Who is the Reverso One Duetto Q336247J for?

This reference suits a buyer who wants two distinct dial looks in one watch and is drawn to the Reverso's reversible case as a genuine mechanical feature rather than a styling detail. It appeals to collectors who already own a classic rectangular Reverso and want a second piece in JLC's more jewellery-oriented elongated case, as well as buyers coming to the brand specifically for the Duetto concept rather than for JLC's other complications. Buyers who want a lower entry price, a single dial, or a case that sits flatter on the wrist are generally better served by the Reverso One Cordonnet or the Reverso Classic Small, both built around simpler, lighter cases.

Price and availability in 2026

Bizak & Co. sources watches to order; this catalogue entry is not confirmation that a specific example is on hand for immediate delivery. On 28 September 2026 our sourced catalogue listed the brand-new Q336247J at US$52,499, against US$6,699 for the Reverso One Cordonnet 3264520 and US$3,999 for the Reverso Classic Small 2618130, all subject to change and configuration. The gap between the Duetto and JLC's entry Reverso One references reflects the solid gold case, the diamond bezel, the manual movement and the second dial together, not any single feature in isolation. High jewellery Reverso references, including historic Duetto pieces, have appeared at the major watch auctions over the years; Sotheby's watches department is a useful reference point for how jewellery-grade Reverso watches have traded at auction in recent seasons, though a current-production Reverso One Duetto is more likely to change hands through retail and private sale than a headline auction lot. Before purchase we confirm the actual watch, recent photographs, included accessories, price and expected timing.

Is the Reverso One Duetto Q336247J a good buy?

Buy the Q336247J for the specific combination of a solid gold reversible case, a diamond-set bezel and two working dials in one watch, not as a speculative flip. High jewellery watchmaking from JLC's Reverso One line moves more slowly through the secondary market than the brand's steel sport watches, and resale interest tracks buyers who specifically want the Duetto concept rather than shoppers comparison-browsing dress watches generally. A full-set example with box, papers and both dials in original, unpolished condition holds more interest at resale than a watch-only piece; ask for a written cash-buy assessment before committing if resale matters to you.

Buying a Reverso One Duetto Q336247J: what to check

• Flip mechanism smoothness. Slide and flip the case yourself. It should move without grinding, catching or excessive play in the rails.
• Both dials' condition. Inspect the silver and black dials separately under strong light; a Duetto's value depends on both faces being original and undamaged, not just the one shown in listing photographs.
• Diamond setting condition. Confirm no stones are missing or visibly loose on the bezel, and ask for close photographs under strong light.
• Case and bracelet condition. Rose gold marks more visibly than steel; check the case corners, which take the most contact on a rectangular or elongated case, and the bracelet links for stretch.
• Box, papers and service history. Ask what documentation comes with the watch, including any diamond grading paperwork if originally supplied.
• Price against the band. A full-set Q336247J offered well under the range above is the single most reliable warning sign.

Our authentication process describes what we inspect before dispatch.

Quick answers

How much is a Jaeger-LeCoultre Reverso One Duetto Q336247J?

Bizak's sourced catalogue listed the brand-new Q336247J at US$52,499 on 28 September 2026, sourced to order and subject to change and configuration.

What does Duetto mean on a Reverso?

It means the reversible case carries a second, fully functional dial on the reverse face rather than a plain or engraved caseback, giving the watch two distinct looks.

Why does the Reverso case flip?

Jaeger-LeCoultre designed the reversible case in 1931 so polo players in British India could turn the watch face to protect the crystal with the solid metal caseback during matches; the flip is now used mainly for decoration and, on Duetto references, a second dial.

What is the difference between Reverso One and the classic Reverso?

Reverso One is JLC's elongated, more oval-proportioned branch of the family, developed for smaller and women's wrists, while the classic Reverso Classic keeps the rectangular case closest to the 1931 original.

Is the Q336247J solid gold or gold-plated?

Solid. Jaeger-LeCoultre builds the Q336247J case and bracelet in rose gold rather than a plated or capped construction.

Request a Reverso One Duetto Q336247J sourcing quote

Tell us your preferred dial condition, whether box and papers are required, plus your budget and timing, through our sourcing enquiry form. We confirm the specific watch, photographs, papers and final price before you commit. Catalogue entries: Reverso One Duetto Q336247J, Reverso One Cordonnet 3264520, Reverso Classic Small 2618130; browse the Jaeger-LeCoultre collection, the watches over $50,000 collection, or sell or trade your Reverso.

Related reading: Patek Philippe price guide · Audemars Piguet price guide · Watch nicknames explained · Pre-owned watches.