Certamen — Swiss Made Modular Women's Sport Watch with PVC Straps

A 24mm or 36mm sport-elegant watch for women — active in material, calm in design, built on the modular system that lets one watch cover more of life.

Why It Exists

• Swiss Made with Ronda 762 movement and K1 sapphire-coated glass
• 24mm case with 12mm straps, or 36mm case with 20mm straps — both fully interchangeable within the modular system
• Two PVC straps included: black and white
• Tool-free strap swaps in seconds
• Individually numbered, small-batch Swiss production with certificate and 24-month warranty

The Watch

Designed to Move. Refined to Endure. Certamen is the sport-elegant expression for women — a 24mm or 36mm watch that balances active materials with a calm design language. It is built for movement, finished with restraint, and shares the full modular conviction of the collection.

Made to Adapt to Your Day. The modular system began with a frustration: a watch should not become unwearable because a strap broke or a style changed. Certamen brings that conviction to a women's sport context — one watch head, straps that change by hand, a case available in two sizes without compromise on Swiss quality. Time should never limit your style. Your watch should not either.

Swiss Made. Built for Movement. Each Certamen is Swiss Made, powered by a Ronda 762 movement, and finished with K1 sapphire-coated glass. The case is available in 24mm or 36mm — the 24mm with a 12mm band width, the 36mm with a 20mm band width. Two PVC sport straps are included — black and white — chosen for durability, ease of maintenance, and a clean aesthetic that moves between active and everyday. Every watch is individually numbered and produced in small batches in Switzerland, accompanied by a certificate of authenticity and a 24-month international warranty. Nine to twelve months is the timeline. Swiss made-to-order does not rush.

Two Expressions. One Timepiece. Certamen is fully modular. The watch head releases from the strap without tools, and the two included PVC straps are a starting point — any compatible strap in the collection fits, 12mm straps for the 24mm case, 20mm straps for the 36mm case, whether PVC, leather, or metal link. A morning run and an evening out no longer require different watches. They require a different strap, changed in seconds.

Make Certamen Your Own. Certamen is made to order and individually numbered — created for women who want a timepiece that moves effortlessly between an active lifestyle and everyday refinement. Two sport-inspired expressions give you the freedom to adapt the same watch to the pace of your day while keeping its distinctive character at the centre.

Choose the expression that fits the moment. Change it when the moment changes. Keep the individually numbered timepiece that connects them both.

Specifications

Manufacturing & Delivery

Made to order in Switzerland

Every Christopher Butendorff watch is made to order and produced in Switzerland. From the moment your order is confirmed, production takes approximately 9 to 12 months.

That timeline is deliberate. Each watch is handmade, assembled, and quality-checked by Swiss watchmakers, then finished and individually numbered as part of a limited edition. We produce in small batches rather than at scale — the process is closer to commissioning a piece than buying one off a shelf.

What happens in that time:

• Case machining, finishing, and assembly
• Movement installation and regulation
• Hand assembly and quality control
• Individual numbering and certificate preparation

When your watch is ready, it ships with a certificate of authenticity and a 24-month international warranty covering manufacturing defects.

Returns: Unused watches in original condition and packaging may be returned within 30 days. Because each piece is made to order, we encourage you to reach out with any questions before purchasing.

Frequently Asked Questions

How is Certamen different from Venustus?

Certamen uses PVC sport straps and has a sport-elegant character. Venustus uses leather straps and leans toward feminine elegance. Both come in 24mm (12mm straps) or 36mm (20mm straps) and share the same modular system — the materials and character differ.

Can I pair Certamen with leather or metal straps?

Yes. Any compatible strap in the collection fits — 12mm straps for the 24mm case, 20mm straps for the 36mm case — swapped by hand without tools.

What do the case sizes refer to?

The numbers — 24mm, 36mm, and 42mm — refer to the watch head (the case that holds the dial and movement), not to wrist size. These are the available case sizes across the collection. A smaller case offers a more understated presence on the wrist; a larger case makes a stronger statement. Choose the case size that matches how you want the watch to look and wear. Certamen is available in 24mm and 36mm.