Strap for Big Crown ProPilot Altimeter Feet / Stainless Steel

The lug width of the Oris ProPilot 01 733 7705 4134-Set 8 23 19 is 23mm, a non-standard measurement that requires specifically dimensioned straps. This value is not interchangeable with 22mm or 24mm lugs, as altering it would compromise the geometry of the case attachments. To verify the measurement, insert a digital calliper parallel to the movement between the upper or lower lug shoulders.

The ideal strap depends on use and dial variant. For formal elegance, alligator in burgundy brown or pure black creates refined contrast with the brushed stainless steel case. For daily wear and light sports, a vintage cotton or nylon NATO offers practicality and moisture resistance. For technical contexts or light diving, vulcanised rubber in black is the most functional choice. Smooth calf leather in caramel tone represents the classical compromise between aesthetics and versatility.

To change the strap, you will need a small flathead screwdriver or a spring bar tool. Apply gentle pressure to the end of the spring bar securing the strap to the upper lug, retracting it slightly, then remove the old strap. Repeat for the lower lug. Insert the new 23mm strap by engaging the spring bars into their respective positions. Verify that the strap is symmetrical and does not rotate around the lugs.

Only straps specifically dimensioned to 23mm lug width are compatible. At milanostraps.it you will find a complete selection of artisanal leather (alligator, calf, shell cordovan), NATO straps, and vulcanised rubber, all shaped for this lug width. Casati Milano straps are custom-made to ensure precision in attachments and overall aesthetic coherence with your watch.

A quality leather strap (alligator, calf, shell cordovan) subject to ordinary use will last 5-7 years before replacement is necessary. Factors such as wear frequency, ambient humidity, perspiration, and sun exposure affect longevity. A vegetable-tanned strap develops patina and visible wear over time, which adds character but may eventually require replacement. Vulcanised rubber typically lasts 3-4 years before showing signs of UV degradation. Regular maintenance (gentle cleaning, complete drying after perspiration) can extend useful life by approximately 2 years.