Strap for Divers Sixty-Five 38 Oris Central

The lug width (or ansa width) of the Oris Divers Sixty-Five 01 733 7771 4018-Set is precisely 19mm. This dimension reflects the historical proportions of the Fifty-Five models from the 1960s and ensures perfect aesthetic balance with the 38mm cylindrical case. Correct measurement is taken as the internal distance between the lug shoulders, not the pin diameter. Any aftermarket strap must present a terminal width of exactly 19mm to guarantee precise fit.

The choice depends on intended use. A vegetable-tanned alligator or calf leather strap in brown or black tones enhances the formal-adventurous character of the model and represents the classic aesthetic choice for this watch. For saltwater use, a 19mm NATO nylon strap ensures immediate drainage and rapid drying, eliminating corrosion risks. FKM (Viton) rubber offers proven resistance to oils, solvents, and chlorine. All available materials are compatible with the 19mm lug width and allow the wearer to adapt the watch to different contexts of use.

Strap replacement requires extraction of the spring bars (connector pins). Use a dedicated spring bar removal tool to apply light pressure and lift the pin inward toward the case. Once the pin is extracted from one side, the strap comes free easily. Insert the pin into the new strap, aligning the holes, and press gently until it clicks into position. The procedure should be performed on a soft surface (such as microfibre cloth) to avoid scratching the case. If unsure, consult a professional watchmaker.

Yes, the 01 733 7771 4018-Set is fully compatible with any aftermarket 19mm lug width strap. The standard pin width is universal, and MilanoStraps offers a comprehensive selection of artisanal leather straps (alligator, calf, shell cordovan), NATO textiles, and technical rubber. Each strap is tested to ensure precise fit without play in the 19mm lug width. The build quality of a premium aftermarket strap often exceeds the original bracelet in terms of aesthetic customisation and material longevity.

An artisanal leather strap, with proper maintenance, can last between 5 and 10 years of daily wear, depending on climate and exposure to aggressive elements. Vegetable-tanned leather ages better than industrial alternatives, developing a patina that increases aesthetic appeal. Prolonged exposure to salt humidity, perspiration, and UV rays significantly reduces lifespan. A NATO nylon strap lasts considerably longer (10-15 years) because synthetic material does not degrade through organic oxidation. FKM rubber has a durability of 7-12 years depending on use and exposure to concentrated sunlight. Rotating between multiple straps significantly extends the life of each one.