Strap for 1966 40 Stainless Steel Diamond

The lug width of the Girard-Perregaux 1966 49555D11A131-BB60 is 20mm. This measurement is the standard for dress watches with a 40mm case diameter and was calculated by Girard-Perregaux to ensure optimal proportions between case size and dial visibility. Always verify the lug width by removing the original strap and measuring the bar connecting the lugs.

For the 49555D11A131-BB60, the ideal strap depends on intended use: dark brown alligator remains the most refined choice for formal occasions, as the reptile's natural grain provides visual dimensionality and pairs perfectly with the stainless steel case. Vegetable-tanned calf leather is recommended for those seeking natural patination over time. For less formal professional settings, a reinforced textile NATO offers versatility and practicality without aesthetic compromise.

Strap replacement requires a spring bar remover tool. Insert the tool's tip into the groove of the upper spring bar, apply gentle pressure, and simultaneously slide the old strap upward. Repeat on the opposite lug. Insert the new strap by aligning its holes with the spring bar ends and push gently until you hear a click. The process takes only minutes and requires no technical expertise.

Yes, any strap with a 20mm lug width is compatible with the 49555D11A131-BB60. High-quality aftermarket straps—such as those in natural alligator, vegetable-tanned calf, or woven NATO—will not damage the case and offer opportunities to reinterpret the watch's aesthetic identity. Always verify that the lug width is precisely 20mm before purchasing.

A high-quality leather strap (alligator or calf) typically lasts 3–5 years with daily use, or up to 7–10 years with occasional wear. Longevity depends on the tanning method: vegetable-tanned calf ages magnificently and its aesthetics improve with time. Alligator is more resistant to moisture and wear. Regular maintenance (cleaning with a damp cloth, treatment with specialized products) significantly extends the strap's useful life.