Strap for Osmior Automatic Single Push-Piece Chronograph Black

The Leroy Osmior Range LL101/2 features a lug width of precisely 20mm, measured from the inner shoulder of one lug to the other on the pink gold case. This dimension is non-negotiable for the aesthetic integrity and functional wearability of the monopoussoir chronograph. Any deviation—whether 18mm or 22mm—will result in visible gaps at the lugs or poor integration with the case architecture.

For the Osmior Range LL101/2 in pink gold, an African alligator strap with regular grain in dark brown or cognac is the ideal choice. Alligator allows the reflective qualities of pink gold to shine whilst maintaining visual restraint. As an alternative, vegetable-tanned Italian calf leather in an aged finish dialogues beautifully with the precious metal. For versatility, a military-grade canvas NATO in dark blue or tan provides sophisticated visual contrast whilst respecting the chronograph's constructive rigour.

Strap replacement on the LL101/2 is accomplished via the spring bars (spring-loaded pins) that support the lugs. Using a dedicated spring bar tool, compress the lateral pin to release the strap from the case lug. Repeat at the opposite lug. To install a new strap, align the buckle or passant with the lugs, insert the pin into the case seat, release pressure, and verify secure seating. This operation should be performed in well-lit conditions with proper tools to avoid damage to the precious metal case.

Yes, any aftermarket strap with a genuine 20mm lug width is fully compatible with the LL101/2. It is imperative to verify that the strap is constructed to true 20mm specification and features a buckle or deployante appropriate for the pink gold case material. We strongly advise against low-quality synthetic or rubberised materials that would compromise the elegance of the chronograph. Milano Straps curates a selection of 20mm straps in alligator, calf, NATO and rubber, each tested for structural compatibility and aesthetic coherence with timepieces of this calibre.

The longevity of a natural leather strap—alligator or calf—depends upon usage conditions and maintenance. A high-quality leather strap typically retains functional and aesthetic integrity between 3 and 7 years with regular wear (3–4 days weekly) in temperate climates. Prolonged humidity exposure, intense perspiration, and UV radiation accelerate degradation. Vegetable-tanned leather develops natural patina over time, enhancing aesthetic value. Periodic maintenance (cleaning and conditioning) significantly extends operational lifespan. For humid environments or intensive use, rubber or NATO straps offer practical alternatives whilst safeguarding the pink gold case.