Strap for Classic Date 37 Stainless Steel / Black

The lug width is precisely 18 millimetres. This measurement refers to the distance between the two spring bar pins that attach the strap to the case lugs, measured perpendicularly. The 18mm standard is a classical dimension reflecting the proportional heritage of Swiss watchmaking from the 1960s and 1970s, perfectly coherent with the 37mm case diameter.

Strap choice depends on intended use and personal preference. For formal contexts, vegetable-tanned alligator in medium brown offers elegance and developing patina over time. For daily wear, premium calf leather guarantees comfort and refined tactile texture. A canvas NATO strap delivers versatility for varied occasions, whilst vulcanised rubber remains the most resilient solution for humid or occasional aquatic environments.

The procedure requires a spring bar tool, a specialised fork-shaped instrument with flat ends. Position the flat end beneath the attachment pin inside the lug, applying gentle downward pressure to compress the internal spring mechanism. Once the pin releases, extract the old strap. Repeat on the opposite side. Align the new strap's holes with the lug shoulders, then reinsert the pins until they click into place. Verify that both sides are securely fastened.

Any strap with an 18mm lug width is compatible with this model. The selection includes natural leather straps (alligator, calf, crocodile), fabric NATO straps, vulcanised rubber bands, and for vintage enthusiasts, Cordura or canvas webbing. Always verify that the lug width is exactly 18mm before purchase to ensure perfect fitting.

Leather strap longevity depends on material quality, intensity of use, and climatic conditions. Premium vegetable-tanned leather, with regular maintenance and protection from excessive moisture, lasts 3–5 years of daily wear. Less robust calf typically endures 2–3 years. Alligator, owing to its dense fibrous structure, easily reaches 5–7 years. Vulcanised rubber, if well maintained, surpasses 10 years. Preventive replacement is recommended before the strap exhibits structural deterioration.