Omega
Speedmaster Moonwatch CK2915-2— lug 19mm

The lug width of the CK2915-2 is 19 millimetres. This dimension is fixed and determined by the geometry of the three-piece case, where the lugs are machined from the central body. It is not possible to use straps of different widths without compromising the mechanical fit and final aesthetics.

Alligator represents the most coherent aesthetic choice: the linear texture of the leather reflects the minimalist design of the instrument and develops an authentic patina over time. A valid alternative is technical fabric NATO, which maintains the historical backup function and resists any environmental stress. Calf leather offers tactile softness, and vulcanised rubber is ideal for hot and humid climates.

The CK2915-2 is fitted with a strap via the case lugs, which are secured by spring bars. It is necessary to remove the bars with a dedicated tool (spring bar tool) by applying calibrated inward pressure. Once the lugs are freed, the strap slides off. To fit the new strap, align the lug hole with the case hole, insert the spring bar and ensure that both ends of the spring snap into position. If you are not experienced, consult a professional watchmaker to avoid damage to the case.

Yes, all straps with a lug width of 19 millimetres are mechanically compatible. However, construction quality varies significantly. Low-end straps use synthetic or printed leathers that degrade rapidly. For a watch of this historical importance, it is advisable to choose straps made from natural materials—alligator, calf, shell cordovan—and with hand-stitching that guarantees longevity and aesthetic quality over time.

Durability depends on the material chosen and usage. Professional-grade alligator lasts 5-7 years with regular maintenance (annual cleaning and conditioning). Calf leather, being less structured, tends to give way at flex points after 3-4 years, especially if exposed to frequent moisture. Shell cordovan, if available, lasts 10 years or more thanks to the natural density of the fibre. Technical fabric NATO lasts indefinitely if washed periodically. Maintenance (cleaning, protection from direct impact) significantly extends the useful life of any strap.