The WSTA0122 is the reference you'll find on the newest warranty cards: the large Tank Must SolarBeat as Cartier delivers it today, on the steel bracelet. The formula is the one that made the solar Tank a modern favorite – a steel case of 33.7 x 25.5 mm and just 6.6 mm thick, a silvered dial with Roman numerals, blued sword-shaped hands, the blue spinel cabochon in the beaded crown, and a photovoltaic movement that charges itself through the dial. Nothing to wind, nothing to replace, nothing to think about – except the one thing Cartier leaves entirely to you: what it wears. Here's the correct strap size for the WSTA0122 and the leather that suits it best.
Which Strap Size Fits the WSTA0122?
The Tank Must SolarBeat WSTA0122 takes a 19mm strap. On our product pages, simply select the 19mm option – that is the correct fit for the large 33.7 x 25.5 mm case.
A note on Cartier's reference numbers, because the SolarBeat family has collected a few: every large Tank Must SolarBeat shares this same case, so whether your papers say WSTA0122 or an earlier large reference, the strap size is identical – 19mm. The small SolarBeat models (22 mm across the case) take 16mm instead, and the XL automatic Tank Must takes 23mm. When in doubt, measure the case width: 25.5 mm means 19mm straps.
Swapping is easy. The lugs accept a classic two-piece strap on standard spring bars, and every Helvetus strap comes with its own buckle included – the bracelet goes into the box complete, with nothing removed from it.
A Quick Look at the WSTA0122
The Tank's design brief hasn't changed since 1917: parallel brancards, Roman numerals, perfect proportions. What has changed is that the current generation no longer needs you at all – light filters through fine perforations in the dial to feed the photovoltaic cells, and the watch simply runs, year after year. The WSTA0122 is that idea in its large size and its most current form, delivered on a steel bracelet with a folding clasp.
The bracelet suits the watch's modern character – but it also sets up the easiest upgrade in luxury watchmaking. The Tank spent its first century on leather; that's the face every Tank photograph in history shows. One strap swap gives the WSTA0122 back that original character, and it does the bracelet a favor at the same time: polished links pick up hairline scratches from desks and doorways within months, while a strap absorbs daily life without complaint. Keep the steel pristine for the occasions that want it, and let leather handle the everyday.
And since the movement will outlive several straps without ever needing attention, choosing that leather well is, quite literally, the only maintenance decision this watch will ever hand you.
The Best Straps for the Cartier Tank Must SolarBeat WSTA0122
A silvered dial, blued hands, and clean steel lines pair with almost anything – but a few combinations stand above the rest on this reference.
1. Brown Leather – The Born-on-Leather Look
The brown leather strap for the Cartier Tank is the Tank as the world has known it for a hundred years: warm leather under cool steel, heritage without effort. Against the silvered dial, brown adds depth and softness that steel links simply can't, turning the most modern Tank movement into the most timeless Tank look. The first strap to own for this reference, and one of the most popular choices among Tank owners.
2. Black Crocodile – The Formal Setting
For evenings and occasions, the black crocodile leather strap dresses the WSTA0122 all the way up. Structured black scales beneath a silver rectangular dial is the definitive dress-watch formula – sharp with tailoring, flawless after dark, and a dramatic change of character from the bracelet.
3. Blue Leather – The Signature Thread
Blued sword hands above, a blue spinel in the crown – the blue leather strap picks up the accents Cartier built into the watch and carries them across the wrist. Deep blue on silver is refined, quietly modern, and endlessly wearable. The choice for owners who want the swap to look factory-intended.
4. Green Leather – The Must Color
Green has become the color of the modern Tank Must family, and the green leather strap brings that spirit to the SolarBeat. Rich green against silvered steel feels current and confident – a nod to the collection's most talked-about shade, on the watch that best represents where the Tank is heading.
Want to see everything? The full strap collection for the Cartier Tank includes further colors, grained finishes, and crocodile textures – all available in the 19mm fit for this reference.
Final Thoughts
The WSTA0122 will keep perfect time on nothing but daylight for years to come – dressing it well is the whole of your job. Rotate a strap or two, keep the bracelet flawless in the box, and enjoy the rare pleasure of a luxury watch that asks for light and nothing else.
Helvetus is one of the leading names in aftermarket straps for luxury watches, and our Tank straps are cut for these slim rectangular cases rather than adapted to them. Every order ships free worldwide with no import costs, returns are easy, and more than 50,000 watch owners around the world trust our straps on their timepieces. The watch takes care of the time – you take care of the style.
