Strap for Speedmaster Professional Moonwatch Moon Flag

The lug width of the Omega Speedmaster Moonwatch 3574.50.00 is 20 millimetres. This width corresponds to the case lugs and ensures precise alignment between the strap and the stainless steel case profile, without lateral play.

The ideal strap depends on use: natural alligator or vegetable-tanned calf emphasizes formal elegance; anthracite grey rubber keeps the Moonwatch in sports territory; shell cordovan offers exceptional durability with natural lustre. The choice should complement the chronograph's instrumental character while maintaining aesthetic coherence with the case's satin-finished steel.

Changing the strap on the Speedmaster requires a spring bar tool. Insert the tool into the small slots on the sides of the lug, apply gentle pressure to release the spring pin, remove the pin and old strap, then insert the new strap and reinsert the pin, ensuring it clicks securely on both sides.

Yes, any strap with a 20mm lug width is compatible with the 3574.50.00, provided it is handcrafted from premium leather and fitted with a stainless steel or gold deployant clasp. We recommend straps that respect the model's construction standards, avoiding economy finishes that would contrast with the chronograph's instrumental quality.

The lifespan of a leather strap depends on material and use: vegetable-tanned calf maintains tactile and chromatic performance for 3-5 years in daily wear; shell cordovan resists beyond 5-7 years thanks to its compact fibre structure; natural alligator evolves patina over time while retaining structural integrity for 4-6 years. Restoration by specialized professionals (such as Casati Milano) extends the useful life of any strap.