Strap for Fifty Fathoms Chronographe Flyback Stainless / Black / Black Canvas

The lug width is 23 millimetres. This means that the strap must have spring bars (lugs) of exactly 23mm width to fit correctly into the case slots. A measurement error risks permanent damage to the case slots when inserting or removing the strap.

The Blancpain Fifty Fathoms 5085F-1130-52 pairs exceptionally well with alligator, shell cordovan, vegetable-tanned leather, and NATO/fabric straps. For intensive marine use, we recommend shell cordovan (moisture resistance) or FKM rubber. For daily versatility, cognac alligator or NATO in neutral colours perform excellently. Browse our 23mm compatible straps in the online collection.

Place the watch on a soft cloth. Use a spring bar tool to gently push inward the small hook located at the bottom of the lug slot. This releases the spring tension and allows you to remove the old strap. To install a new 23mm strap, reinsert the last 5–10 millimetres of the spring bar into the slot, then press inward until you hear the 'click' of spring retention.

Yes, provided the strap has been manufactured with an exact 23-millimetre lug width. Casati Milano artisanal straps and leading specialist brands offer custom-cut models for this size. Avoid generic 'one-size-fits-all' straps, which often have unacceptable manufacturing tolerances.

Durability varies by material and usage. A vegetable-tanned alligator strap lasts 4–6 years with regular maintenance (quarterly conditioning). Shell cordovan, denser and oilier, can exceed 8–10 years. NATO and rubber straps have indefinite durability, except for mechanical wear. Marine humidity accelerates ageing: if you use the watch frequently at sea, expect an earlier leather strap replacement cycle.