Strap for Speedmaster Professional Mark II Racing

The lug width of the ST 145.014 Racing model is 20 mm. This measurement is the fundamental specification for selecting any compatible strap and is measured from the base of one lug to the other, taking into account the thickness of the spring bar.

For the Racing, we recommend vegetable-tanned alligator in dark brown tones or shell cordovan, which enhance the model's sporty and vintage identity. Soft calfskin is ideal for those seeking everyday comfort, while NATO straps offer versatility and quick changes. The choice depends on use (formal, sporty, everyday) and personal aesthetic preference.

Strap replacement requires extraction of the spring bars (horizontal metal pins) from the lugs of the case. Using a fine-tipped screwdriver or dedicated tool, gently push the spring bars outward until they release. Subsequently, insert the new spring bars into the strap and position them in the case lugs until fully seated.

Yes, any strap with a 20 mm lug width is compatible with the Speedmaster Moonwatch ST 145.014 Racing. It is essential to verify that the width corresponds exactly: an undersized lug width creates lateral gaps, while an oversized one will not fit into the case lugs.

Durability depends on the material and usage. A quality alligator or calfskin strap, with everyday use and proper maintenance, lasts 3–5 years before showing significant signs of wear. Shell cordovan can last 7–10 years thanks to its natural density. Rotating with alternative straps (NATO, rubber) extends the lifespan of each individual strap.