Strap for Big Crown ProPilot Chronograph GMT Stainless Steel / Black

The Oris ProPilot 01 677 7699 4164-07 5 22 15FC requires a strap with a 22mm lug width. This dimension is measured internally between the two lugs of the case. To verify it, measure the distance from the inner edge of one lug to the inner edge of the other: the result must be exactly 22mm. A strap constructed specifically for this width guarantees perfect fit without lateral play, a critical element for an instrument requiring precise readings.

For the ProPilot 01 677 7699 4164-07 5 22 15FC, several solutions are recommended depending on use context. An alligator strap communicates maximum formality and dialogues perfectly with the satin-finished case. A vegetable-tanned calf develops over time, acquiring natural patina. Technical NATO straps offer moisture resistance and ease of maintenance. Vulcanised rubber represents the solution for extreme performance. Your choice depends on the balance between aesthetics and operational functionality you wish to emphasise.

Strap changing requires a spring bar tool, a small flat instrument with a notch at both ends. Position the watch face-down on a soft surface. Insert the spring bar tool into the notch of the spring at one lug (the pin connecting the strap). Press gently downward to compress the spring, then remove the pin. Repeat on the other side. To install the new strap, align the holes with the lugs, insert the pins by compressing the springs until they click into place. The procedure takes 2-3 minutes and requires no specialist skills.

No, this is not recommended. A strap with a lug width greater than 22mm will generate lateral play and unwanted movement. A strap with a smaller lug width may not insert completely or could damage the lug springs. Exact compatibility ensures stable fit, safety during use (critical if you use the chronograph operationally) and preserves the aesthetic geometry of the 44mm case. Milano Straps offers straps specifically designed for 22mm in multiple material variants.

The lifespan of a leather strap depends on the material, tanning method and intensity of use. Vegetable-tanned calf, worn daily, typically resists 18-24 months before requiring replacement due to structural wear (thinning, cracking). Alligator, a denser material, can reach 24-36 months. Frequent cleaning and exposure to moisture accelerate ageing. If the chronograph is used primarily in dry environments and with rotating straps (alternating with rubber or NATO), leather lifespan extends significantly. Milano Straps provides straps built for durability, where leather selection prioritises compact fibre and structural thickness.