Strap for Big Crown Original Pointer Date 40 Poly Vacher / Wings Around the World II – Voyage to the Ice

The Oris Big Crown 654 7543 40 84 LS features a 20-millimetre lug width. This measurement is determined by the case architecture and proportions established by the Swiss manufacture. To verify correctly, place a ruler orthogonally between the two lug ears (the protrusions where the strap connects) and measure the distance. Precise measurement is essential to ensure proper strap fitting and the final aesthetic of the watch.

The choice depends on your intended use and desired aesthetics. Alligator leather offers formal elegance and pairs naturally with business contexts; vegetable-tanned calf provides soft tactile texture and a patina that evolves over time; NATO woven straps deliver sporting versatility and daily practicality; FKM rubber ensures maximum durability in extreme conditions, humidity, and intensive use. For this aviator timepiece, a cognac leather strap or navy blue NATO strap creates both aesthetic and functional harmony.

Strap replacement requires two basic tools: a spring bar tool (axis extractor) and a stable flat surface. Position the watch so the lugs are accessible, insert the flat tip of the spring bar tool under the spring bar, pushing slightly downward until the end retracts; remove the old strap. Repeat on the other side. To install the new strap, align the strap holes with the axes, insert the spring bar, and push until you hear a click of closure. Controlled but decisive movements prevent damage to the case.

Yes, absolutely. Many quality watch owners opt for artisanal aftermarket straps from specialised workshops such as Milano Straps. The important thing is to verify the correct lug width (20mm in your case) and attachment compatibility. Artisanal straps in alligator leather, calf, or shell cordovan, bespoke crafted, often offer superior construction quality compared to OEM straps and allow aesthetic and functional personalisation suited to your daily use.

The lifespan of a leather strap depends on leather quality, frequency of use, and environmental conditions. An artisanal calf or alligator strap with vegetable tanning typically lasts 3–5 years with daily wear, extending to 7–10 years if rotated with alternative straps. Constant exposure to water, humidity, perspiration, and UV rays accelerates wear. To extend useful life, protect the strap from excessive moisture and rotate it regularly with NATO or rubber alternatives during humid seasons or sporting activity.