Strap for Speedmaster Professional Moonphase Platinum / Skeleton

The 3688.30.32 reference has a lug width of exactly 20 mm. This measurement is determined by the width of the bayonet spring integrated into the lugs of the platinum case. To verify strap compatibility, it is essential to measure perpendicularly the distance between the two shoulders of the spring: any deviation of even 1 mm would compromise proper fit and mechanical safety.

For a 3688.30.32 in platinum, black or brown alligator in vegetable tanning remains the most balanced choice: the regularity of the grain and the ability to develop natural patina pair perfectly with the formal severity of the case. Vegetable-tanned calf offers a sophisticated alternative with chromatic evolution over time. For intensive use, shell cordovan ensures exceptional water resistance and longevity, although it represents a rarer and more contemporary choice.

The 3688.30.32 uses a bayonet spring integrated into the lugs. To remove the strap, you must access the spring from each side with an appropriate tool (typically a removable pin) and gently compress the spring to free it from the strap seat. Insertion of the new strap is accomplished by applying the tang onto the spring, ensuring it snaps correctly into position. The operation is recommended to be performed on a soft surface and, if uncertain, consult an authorized service center.

Any strap with a 20 mm lug width is compatible with the 3688.30.32, provided the width is constructed with strict tolerances (±0.2 mm). Online you can find straps in alligator, calf, shell cordovan, NATO, and rubber from specialized suppliers; the atelier Casati Milano creates custom leather straps with direct choice of raw materials and guarantee of perfect fit.

Durability depends on leather quality, frequency of use, and care. A quality alligator or calf strap, worn daily, maintains structural integrity between 5 and 8 years; shell cordovan, thanks to its natural density, can exceed 10 years. Direct exposure to sunlight, salt water, and sweat accelerates aging. Preventive maintenance—regular cleaning with a damp cloth and annual conditioning with natural waxes—significantly extends the functional life of the strap.