Strap for Pilot Chronograph Staineless Steel / Black / Bracelet

The Archimede Pilot UA7939B-C1.1 features a lug width of 20mm. This dimension is determined by the geometry of the 42mm case and represents the standard for any aftermarket strap installation. Always verify the lug width before purchasing a replacement strap.

For a watch with this aviation heritage, we recommend premium natural leather straps—alligator or vegetable-tanned calf for a vintage aesthetic with evolving patina, or technical NATO and rubber straps for intensive use and humid environments. A honey-brown alligator strap complements the cream dial of the UA7939B-C1.1, whilst a smoke-grey calf offers contemporary contrast.

Strap replacement requires two tools: a spring bar tool (or a gentle alternative such as a fine needle). Position the watch with the lug facing upward, insert the tool into the slot beneath the lug, press upward to release spring tension, extract the pin and release the old strap. Repeat on the opposite side. Install the new strap by reversing the procedure. A straightforward operation that requires no technical expertise.

Yes, entirely. All our straps manufactured for the 20mm lug width have been constructed and tested specifically for watches with this dimension. The spring bars on every strap are sized to fit precisely and securely into the lug holes of the Pilot UA7939B-C1.1, with zero unwanted lateral play. Choose from our leather, NATO, or rubber collections in 20mm.

A high-quality leather strap, worn daily with minimal maintenance, typically lasts 18–36 months. Longevity depends on ambient humidity, frequency of water exposure, sun exposure, and tanning method. Vegetable-tanned alligator tends to outlast standard calf; however, the patina that develops is integral to the charm of authentic leather. Periodic strap replacement is a natural and recommended practice to preserve the overall aesthetic value of your watch.