Omega
Speedmaster Moonwatch ST 145.0022 AS— lug 20mm

The Moonwatch ST 145.0022 AS features a 20 millimetre lug width, the historic standard of the Professional collection. This dimension is specific and not compatible with 22mm straps: always verify with a calliper perpendicular to the case lugs before purchasing.

For the Moonwatch we recommend vegetable-tanned alligator in dark brown or black tones, which maintains the chronograph's sporty identity while respecting historic proportions. Alternatively, shell cordovan for superior construction density or Italian calf for discrete elegance and natural patina development over time.

The screw-down lugs on the ST 145.0022 AS require a specific tool (1.5mm hex key or watchmaker's screwdriver): insert the key into the screw, unscrew completely, remove the metal lug, insert the new strap aligning the holes, reinsert the lug and tighten evenly without forcing.

Yes, any strap with certified 20mm lug width is compatible with the ST 145.0022 AS. Custom artisan straps from milanostraps.it are crafted to Omega case specifications ensuring precise fit and stability with no lateral play.

A quality alligator or calf strap used daily on a Moonwatch typically lasts 18–24 months before requiring replacement, with natural patina aging in the first year. Vegetable tanning slows oxidation, while moisture and perspiration accelerate wear: an 18-month warranty covers manufacturing defects and ensures affordable replacement costs.