Strap for Speedmaster Broad Arrow Stainless Steel / White

The lug width of the Omega Speedmaster Broad Arrow 3851.20.12 is precisely 20mm. This measurement refers to the internal distance between the two attachment points of the spring bar. It is important to measure correctly: position the ruler between the two internal ends of the spring bar, not the diameter of the bar itself. A compatible strap must fit perfectly to these 20mm without play or forcing.

There is no universal 'best' choice, but rather appropriate choices depending on the intended use. Alligator represents the most versatile and sophisticated solution, thanks to its regular texture that dialogues well with the watch dial. Vegetable-tanned calf offers a more organic appearance and develops a fascinating patina over time. For sports use or humid climates, a rubber strap ensures practicality. A technical canvas NATO allows instant modifications without tools, transforming the character of the watch.

To change the strap, you need to remove the spring bar that passes through the lug. Use a dedicated tool (spring bar tool or a small flat-head screwdriver) to gently compress the spring from the side opposite the strap lug you wish to remove. Once compressed, the lug will release. Insert the spring bar into the new strap by aligning the holes, then position it on the other lug. Finally, slide the spring bar into the first hole: you will feel a slight 'click' when it is correctly seated. Avoid excessive forcing to prevent damage to the spring bar.

Yes, there are numerous quality aftermarket options for the 20mm strap. It is important to verify that the strap is specifically dimensioned for 20mm and that the lugs are constructed with robust materials suitable for the 42mm case diameter. Alligator, calf, rubber, and technical canvas straps are all available from specialized suppliers. Always verify that the lugs are proportioned to the mass of the case and that the attachment is secure through a quality spring bar mechanism.

The lifespan of a leather strap depends on the type of leather and the intensity of use. A quality artisanal alligator or calf strap, with vegetable tanning, can remain in excellent condition for 3-5 years of daily use, after which it naturally begins to show visible signs of wear. With appropriate maintenance (regular drying, avoiding water immersion, occasional cleaning), the lifespan can be extended further. Rubber straps are far more resistant and last 5-7 years before showing material fatigue. The quality of construction is decisive: a hand-stitched strap with quality thread far exceeds industrial standard production in longevity.