Strap for Speedmaster Moonwatch Professional Loyalty Edition

The lug width of the Speedmaster Moonwatch 311.30.42.30.01.008 is 20mm. This measurement is specific to the model and corresponds to the distance between the two metal pins that support the strap. To verify it, use a digital caliper positioned perpendicularly on the pins.

For your 311.30.42.30.01.008 we recommend alligator leather for formal elegance (the scaled texture amplifies technical rigor), calf for everyday minimalism, vegetable tanned leather for progressive patina, or isoprene rubber for sports use and aquatic environments. A versatile approach includes a three-strap collection: black alligator, brown calf, black rubber for different occasions.

The strap on your Speedmaster is removed via the spring bars, which are extracted with a dedicated tool called a spring bar tool. Gently press the pin on one side, causing the free end to slide out of the case seat, then repeat for the other pin. Installing the new 20mm strap follows the reverse procedure: insert the pin into one seat, press with the tool until it clicks into the locked position. If you do not own the tool, Casati Milano offers a strap change service by appointment.

All 20mm straps made for watches with 20mm lug width are compatible with your Speedmaster Moonwatch. On MilanoStraps you will find a complete collection of artisanal 20mm straps in alligator, calf, shell cordovan and vegetable tanned leather, customizable in size, initials and choice of thread color.

The lifespan of a leather strap depends on frequency of use and tanning method. A quality alligator or calf strap, worn daily, maintains structural integrity for 3-5 years. Vegetable tanned leather, being less chemically treated, evolves in color but may show signs of wear more rapidly (2-4 years in intensive use). Casati Milano guarantees 18 months on all custom straps, with the possibility of revision and reconditioning.