Cartier Tank vs Santos de Cartier
Cartier Tank WSTA0108 vs Cartier Santos de Cartier WSSA0018, compared on the specs each brand publishes.
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The short answer
Cartier's two best-known rectangular and square watches, compared on Cartier's specs.
- Case size: the Cartier Santos de Cartier WSSA0018 is 14.3 mm larger (39.8 mm vs 25.5 mm).
- Thickness: the Cartier Santos de Cartier WSSA0018 is 2.78 mm thicker (9.38 mm vs 6.6 mm).
- Water resistance: the Cartier Santos de Cartier WSSA0018 is 70 m more (100 m vs 30 m).
- Price: the Cartier Tank WSTA0108 lists for $5,100 less in the US ($4,100 vs $9,200).
- Movement: Cartier Tank WSTA0108 has Quartz; Cartier Santos de Cartier WSSA0018 has Automatic.
Side-by-side specs
| Spec | Cartier Tank WSTA0108 | Cartier Santos de Cartier WSSA0018 |
|---|---|---|
| Case diameter | 25.5 mm | 39.8 mm |
| Thickness | 6.6 mm | 9.38 mm |
| Calibre | Not stated | 1847 Mc |
| Movement | Quartz | Automatic |
| Water resistance | 30 m | 100 m |
| Crystal | Not stated | Sapphire |
| Case material | Stainless steel | Stainless steel |
| Ships on | Alligator leather strap | Bracelet |
| US list price | $4,100 (US list) | $9,200 (US list) |
| Dial | Black lacquered | Silvered opaline |
| Status | In production | In production |
| Suits wrists of about our sizing guide | 9.8–11.7 cm | 15.9–17.8 cm |
Specs summarised in our own words from the brand's product pages: WSTA0108 source (checked 3 Nov 2026) WSSA0018 source (checked 3 Nov 2026). "Not published" means the brand page we checked doesn't list it, so we leave it blank rather than guess.
Wrist fit
Lug-to-lug decides overhang more than diameter does. Enter your wrist to see how each one should wear.
- Cartier Tank WSTA0108 –
- Cartier Santos de Cartier WSSA0018 –
Same rule of thumb as Watch Finder: case diameter of about 23.5% of your wrist circumference (−2 mm to +2.5 mm), and lug-to-lug no longer than about 29% of it plus 1 mm. A guide, not a rule; flat or round wrists differ.
Which should you buy?
It is the more compact case on paper (25.5 mm across). Our sizing guide puts it at about 9.8–11.7 cm.
It has the lower US list price, $4,100, a $5,100 difference.
It has the higher water-resistance rating: 100 m vs 30 m.
It is the slimmer case at 6.6 mm.
Prices and where to buy
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More: All Cartier Tank references · All Cartier Santos de Cartier references.
Questions
Which is bigger, the Cartier Tank WSTA0108 or the Cartier Santos de Cartier WSSA0018?
Per the brands, the Cartier Tank WSTA0108 is 25.5 mm across and the Cartier Santos de Cartier WSSA0018 is 39.8 mm.
Which is cheaper?
The Cartier Tank WSTA0108, at a US list price of $4,100 vs $9,200 when we checked.
Which is more water-resistant?
Cartier Tank WSTA0108: 30 m. Cartier Santos de Cartier WSSA0018: 100 m.
Have you tested these watches?
No. This comparison uses brand-published specs and our own analysis of them, not hands-on testing.
Watch.co is independent and not affiliated with any brand. We haven't handled these watches for this page: everything here comes from brand-published specs and our own analysis. Brand names are used only to identify products.