Strap for Speedmaster Professional Moonwatch Jubilee Chronometer

The lug width of the Moonwatch 3694.50.00 is precisely 20mm. This width is determined by the case geometry and the architecture of the bayonet lugs. A 19mm strap will enter with excessive play, making the watch unstable on the wrist; a 21mm strap will not fit. The precision of this measurement ensures structural stability and protects the pins over time.

Cognac or caramel-brown alligator is the primary aesthetic choice for the 3694.50.00: the natural scales reflect the patina that yellow gold develops over time. Vegetable-tanned honey-colored calf leather is a contemporary alternative, capable of developing a dark brown patina. Black shell cordovan represents the minimalist choice for those who view the Moonwatch as a daily instrument of lasting durability.

The lugs of the Moonwatch 3694.50.00 feature bayonet fastening. To change the strap: remove the old strap by pressing the bayonet tab laterally (usually upward) and pulling the strap downward; insert the new strap by aligning the tip with the space between the pins and pushing until the locking click is heard. The operation takes 30 seconds per side. Avoid excessive force on the yellow gold pins.

Yes. Any strap with a 20mm bayonet terminal is compatible with the 3694.50.00. MilanoStraps offers straps in alligator, vegetable-tanned calf, and shell cordovan all sized at 20mm with integrated deployant clasp. Compatibility is guaranteed; construction quality (thickness, stitching, biological patina) is what differentiates artisanal straps from industrial straps.

A quality vegetable-tanned leather strap, used daily, has an average durability of 4–6 years before requiring replacement. Vegan-tanned alligator lasts 3–4 years. Shell cordovan, thanks to its superior material density, can exceed a decade if properly maintained (no direct water, specific creams). The biological patina that develops is desirable: it represents healthy aging of the material, not degradation.