The Cartier Santos 100 W20073X8 is a modern classic with a story built in. Released in 2004 to mark one hundred years of the original Santos, it took the historic square case and scaled it up into a bold, contemporary 38 mm watch that stayed in the lineup for over a decade. Unlike the current Santos de Cartier, the Santos 100 was delivered on a strap rather than a bracelet — which means every owner faces the same question sooner or later: the original strap wears out, and it needs a worthy replacement.
This guide explains the correct strap size for the W20073X8 and the most popular Helvetus strap options for this model.
Cartier Santos 100 W20073X8 Strap Size and Fit
Sizing on the Santos 100 is straightforward, but it is different from the modern Santos, so it pays to get it right. For the Cartier Santos 100 W20073X8:
- Model: Santos 100, the classic 38 mm version (often listed as Santos 100 XL)
- Case shape: square, with the signature exposed bezel screws
- Strap width at the case: 23 mm
- Attachment: standard spring bars — no QuickSwitch system on this generation
This means the watch requires a 23mm strap. When ordering, simply select the 23mm option on the product page. Helvetus Santos 100 straps come with spring bars included and are fully compatible with your original Cartier buckle, so the swap keeps the authentic look of the watch intact.
One important note: straps made for the current Santos de Cartier quick-release models will not fit the Santos 100. This reference needs straps shaped specifically for the Santos 100 case — exactly what this collection is built for.
Why the Santos 100 Deserves a Fresh Strap
The Santos 100 was Cartier's celebration of the watch that started it all — the piece Louis Cartier created in 1904 so that the aviator Alberto Santos-Dumont could read the time without letting go of his controls. The anniversary model kept the Roman numeral dial, the blue spinel crown, and the screwed bezel, then gave the case real wrist presence.
Collectors love the W20073X8 today because it wears bigger and bolder than any modern Santos while costing considerably less on the pre-owned market. And because it lives on a strap, a single swap transforms it completely — from heritage dress watch to modern sports piece in a few minutes.
The Best Straps for the Cartier Santos 100 W20073X8
Helvetus offers rubber and leather straps made specifically for the Santos 100 case. You can browse every compatible option here: Cartier Santos 100 Strap Collection.
Below are the most popular choices among owners of this reference, matched to its silvered dial, steel case, and blue spinel crown.
Black Rubber Strap
The Santos 100 originally came on a black strap, and black rubber is its natural modern successor. It keeps the watch true to its character while making it lighter, more comfortable, and completely worry-free in daily wear. This is the bestseller for the Santos 100, and for good reason. Black Rubber Strap for Cartier Santos 100
Black Leather Strap
If you want to stay closest to how the watch left the boutique, black leather is the choice. It preserves the formal, classic presence of the Santos 100 and pairs perfectly with the silvered Roman numeral dial — ideal for anyone who wears this watch with a suit. Black Leather Strap for Cartier Santos 100
Grey Rubber Strap
Grey rubber creates a clean, tonal look with the steel case and silver dial. It is one of the most popular understated choices for this model, softening the bold case just enough for everyday and office wear without losing its edge. Grey Rubber Strap for Cartier Santos 100
White Rubber Strap
The Santos 100 has the presence to pull off white, and few watches do it better. A white rubber strap picks up the bright dial and turns the watch into a striking summer piece — a favorite combination among owners who want the watch to stand out. White Rubber Strap for Cartier Santos 100
Feeling bolder? The Orange Rubber Strap for Cartier Santos 100 adds serious contrast against the steel case and gives this classic an unmistakably sporty personality.
Final Thoughts
The Santos 100 W20073X8 proved that a century-old design could feel completely current, and twenty years on it still does. With the right 23mm strap, it easily keeps up with anything in the modern Cartier catalog.
Helvetus is a leading name in aftermarket straps for luxury watches, trusted by more than 50,000 customers worldwide. Every Santos 100 strap is shaped for a precise fit on this case, rubber straps are covered by a lifetime warranty, and all orders ship free worldwide with no import costs.
Find the perfect strap for your Santos 100 in the Cartier Santos 100 Strap Collection.
