Ludus Timeless Onyx Black — Swiss Made Modular Watch with Interchangeable Sport Straps

A watch built for movement — calm in design, ready in practice, made for the part of life that does not sit still.

Why It Exists

• Swiss Made with Ronda 702 movement and K1 sapphire-coated glass
• Interchangeable PVC sport straps — tool-free swap between black, white and blue
• Individually numbered, small-batch Swiss production
• Modular system designed for active daily wear
• Certificate of authenticity and 24-month international warranty included

The Watch

Designed to Move. Ludus is the sport expression of the modular system — a watch that takes movement seriously without announcing it. The design stays calm. The materials are chosen for resilience. The intention is quiet.

One Watch. Wherever Life Takes You. The modular system began with a frustration: watches that stopped being wearable because a strap broke or could not be swapped. Ludus takes that solution into active territory. A watch should move with you — through a workout, a commute, a weekend — and adapt without forcing you to own three separate timepieces. Time should never limit your style. Your watch should not either.

Swiss Made. Built with Purpose. Each Ludus is Swiss Made, powered by a Ronda 702 movement, and finished with K1 sapphire-coated glass. The case comes in 36mm and 42mm with a 20mm band width. Three PVC sport straps are included — black, blue and white — selected for durability and ease of maintenance. Every watch is individually numbered and produced in small batches in Switzerland, accompanied by a certificate of authenticity and a 24-month international warranty. Made-to-order production takes nine to twelve months — the time required for Swiss craftsmanship, not a delay to apologise for.

Change Your Style in Seconds. Ludus fits the modular system fully. The watch head releases from the strap without tools, so you can swap between the included PVC straps or move to leather, Nato, or metal link — any compatible 20mm strap in the collection. An active morning and an evening out no longer require different watches. They require a different strap, and seconds to change it.

Make Ludus Your Own. Ludus is made to order and individually numbered — created for those who want one watch that moves effortlessly between an active lifestyle and everyday life. Choose your case size, wear it your way, and let the modular system adapt as your style and your day change.

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

Is Ludus suitable for swimming or showering?

Ludus is rated to 3 ATM, which means it handles splashes and rain but is not suitable for swimming, showering, or submersion. Remove the watch for water exposure beyond rain and hand-washing.

Can I pair Ludus with leather or Nato straps?

Yes. Ludus uses the modular system with a 20mm band width, so any compatible 20mm strap in the collection fits — leather, Nato, PVC, or metal link — 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. Ludus is available in 36mm and 42mm.