Strap for Big Crown ProPilot Big Date Stainless Steel / Blue

The lug width of this model is 20mm, meaning the distance between the centres of the two lugs is exactly 20mm. This specification is essential when selecting compatible aftermarket straps. To verify it, use a digital calliper positioned perpendicular to the spring bar holes: the measurement should fall between 19.8 and 20.2mm.

Strap selection depends on intended use. For aviators and enthusiasts seeking to emphasise the model's heritage, a vegetable-tanned calf leather in cognac or dark brown tones is recommended, creating elegant contrast with the brushed steel case. For sporting and outdoor wear, a rubber or NATO fabric strap offers superior mechanical resistance and ease of cleaning. Shell cordovan is ideal for those who appreciate aged patina development.

Strap replacement requires no specialist skills. Obtain a spring bar removal tool or use a fine-pointed pen. Insert the tip into the small hole on the lug side to release the spring tension, extract the spring bar, remove the old strap and insert the new one with proper alignment. The procedure takes minutes and requires no costly equipment.

Yes, provided the strap is designed for 20mm lugs. Quality aftermarket straps maintain rigorous manufacturing tolerances (19.8–20.2mm) and often improve comfort and aesthetic options compared to factory equipment. Always verify that the strap width is explicitly stated as 20mm and that it uses standard-diameter spring bars.

A quality leather strap (calf leather, shell cordovan, alligator) typically lasts between 3 and 7 years with daily use, depending on the tanning method, thickness and environmental conditions. Vegetable-tanned leather ages elegantly but requires greater maintenance in humid environments. Cordovan is more durable owing to its density. Protecting the strap from excessive moisture and abrasive dirt significantly extends its useful life.