Cartier Santos-Dumont: Sizes, Quartz vs Mechanical and Which Reference to Choose

The Cartier Santos-Dumont is a slim, rectangular dress watch that comes in three sizes (Small, Large and XL) and two movement types: battery-powered quartz on the Small and most Large references, and the hand-wound caliber 430 MC on the XL and some Large references. To choose a reference, decide the size first, then whether you want quartz or hand-wound, then the metal. This guide lays out each size and what the movement choice means day to day. Bizak & Co. is a sourcing desk, so every watch mentioned here is sourced to order, not held as stock.

Last reviewed on October 28, 2026 by Filip Biczak. Sizes are manufacturer or authorized-retailer figures and vary slightly by reference. Sources: Cartier, Santos-Dumont Large model, Watches by SJX, Santos-Dumont XL hand-wind and Revolution, Santos-Dumont XL.

What is the Cartier Santos-Dumont?

It is Cartier's slim pilot-inspired dress watch, named after the Brazilian aviator Alberto Santos-Dumont, who asked Cartier for a watch he could read while flying. The modern line keeps a rounded rectangular case, a Roman-numeral dial with a railway minute track and a leather strap. It is thinner and plainer than the Santos de Cartier, which is a different watch; our Cartier Santos collection page covers both families, and the wider Cartier collection shows the rest of the brand.

What sizes does the Santos-Dumont come in?

There are three: Small, Large and XL. The table gives the figures we could source; always confirm the exact reference, because case measurements vary a little between metals and generations.

The Large is the reference size for most buyers because it reads as a classic men's dress watch without looking oversized. The Small suits slim wrists and is often chosen as a women's or unisex watch; our Cartier Santos for women guide compares the options in more depth.

Is the Santos-Dumont quartz or mechanical?

Both, depending on size and reference. The Small and most Large references run on quartz, and Cartier describes the Large steel model's quartz movement as high-autonomy, with a battery life of around six years on its US page. The XL, introduced in 2020, uses the hand-wound caliber 430 MC, a slim movement derived from a Piaget caliber, with a reported power reserve of about 38 hours. A retailer has also listed a Large model with that manual-wind caliber, so the movement is something to confirm per reference rather than assume from the size.

Quartz vs mechanical: which Santos-Dumont movement should you choose?

Choose quartz if you want a grab-and-go watch that keeps accurate time with almost no attention, and choose hand-wound if you value the daily winding ritual and a mechanical movement. The practical trade-offs are simple:

Neither choice is wrong. Quartz fits a watch you pick up on a whim, while the hand-wound XL appeals to collectors who want a mechanical dress watch that stays thin.

Which metal and finish should you pick?

Steel is the practical choice, and gold is the dressier one. Cartier has produced the Santos-Dumont in steel, yellow gold, rose gold and two-tone combinations, along with versions that add diamonds or a skeleton dial. If you prefer warm metals, see our yellow gold Cartier Santos watches and rose gold Cartier Santos watches. Gold references tend to pair with leather straps in grey, black or brown, and the crown is typically set with a cabochon stone that varies by metal.

How do you choose the right Santos-Dumont reference?

Work through four decisions in order, then confirm the reference number.

• Size. Try the Large first; move to the Small for a narrow wrist or the XL if you want a longer case.
• Movement. Decide between quartz convenience and a hand-wound XL.
• Metal. Steel for everyday wear, gold for a dress watch.
• Condition and papers. Decide new or pre-owned, and ask for the box and papers, which should match the reference.

Older Santos-Dumont references can differ from the current line in size and construction; our vintage Cartier Santos guide explains what to look for there.

Quick answers

What sizes does the Cartier Santos-Dumont come in?

Three: Small, Large and XL. Cartier lists the Large at 43.5 x 31.4 mm, retailers list the Small at about 38 x 27.5 mm, and the XL runs about 46.6 x 33.9 mm.

Is the Cartier Santos-Dumont quartz or mechanical?

Both exist. The Small and most Large references use quartz movements, while the XL uses the hand-wound caliber 430 MC. Some Large references have also been listed with a hand-wound movement, so check the reference number.

Which Santos-Dumont size is best for a small wrist?

The Small or Large usually suits a slim wrist best, because the case is a narrow rectangle with a thin profile. The XL wears longer lug to lug, so try it before committing.

Is the Cartier Santos-Dumont the same as the Santos de Cartier?

No. The Santos-Dumont is a slim rectangular dress watch with a simple case and no bracelet screws, while the Santos de Cartier is a square-cased sport watch with an integrated bracelet.

How do I choose the right Santos-Dumont reference?

Pick the size first, then the movement, then the metal and dial. Use the reference number on the case back or papers to confirm all three before you pay.

Related reading: Cartier Santos vs Tank, Who owns the big watch brands, Cartier vs Rolex, The cheapest Cartier watches, Vintage Cartier Santos: eras, references and what to look for, Cartier Santos for women: sizes, references and prices and Cartier Santos, Tank and Crash: how Cartier's design partnerships shaped its watches.

Get your Santos-Dumont sourced

Tell us the size, movement, metal and dial you prefer, whether you want new or pre-owned, and your budget and timing, through our sourcing enquiry form. We confirm the specific watch, photographs and final price before you commit.