Strap for Duochronograph 757 III

The Sinn 757.031 features a lug width of 22 millimetres, measured between the two horizontal lugs that attach the strap to the case. It is essential to verify this measurement before ordering an aftermarket strap, as 22 mm is a less common standard compared to 20 mm or 24 mm. Use a digital calliper for accurate measurement or consult a professional watchmaker.

The ideal strap depends on your intended use: for formal situations or civil aviation, a vegetable-tanned calfskin or alligator strap in black or deep brown offers elegance and durability. For tactical operations or humid environments, a military-grade nylon NATO strap provides resistance, thermal comfort and easy maintenance. FKM rubber is recommended for users who push the instrument properties of the watch to the limit in extreme conditions.

Strap replacement requires a specific tool to remove the horizontal lugs. Position the watch with the lugs facing you, locate the small hole on one of the lugs and insert a 1.2 mm needle to gently lift the lug, then extract it completely. Repeat on the other side. Align the new strap with the holes and carefully reposition the lugs. If you are inexperienced, consult a watchmaker or use our installation service.

Yes. Milano Straps offers a complete collection of 22 mm straps in leather, NATO, rubber and alligator, all compatible with the 757.031. Each strap is tested and certified for measurement accuracy. We recommend consulting the installation photos and technical specifications before purchase to ensure perfect aesthetic and functional compatibility.

A quality leather strap, made with vegetable tanning and properly maintained, lasts an average of 3-5 years with moderate daily wear. Durability depends on factors such as ambient humidity, frequency of wear, sun exposure and maintenance. Protecting the strap from prolonged water exposure and regularly cleaning with a soft, slightly damp cloth significantly extends useful life. NATO straps, by contrast, achieve 7-10 years of intense use thanks to the nature of military nylon.