Strap for Space Chronograph 140 St S

The Sinn 140.030 features a 22-millimetre lug width. This measurement corresponds to the distance between the lug pins—the small cylindrical metal components that attach the strap to the case. Verifying this measurement before purchasing an aftermarket strap is essential to ensure perfect compatibility and maintain the visual proportions of the watch.

The choice depends on your intended use. For technical and professional applications, a NATO strap in regenerated textile ensures practicality and quick changes. If you prefer sober elegance, a shell cordovan or natural vegetable-tanned calf leather strap adds character without compromising the watch's technical identity. For extreme conditions, structured rubber is the most durable and functional option.

The 140.030 employs a fixed lug system with spring bars. To replace the strap: 1) extract the spring bar from the lower end of the lug using a dedicated spring bar tool; 2) slide out the old strap; 3) insert the new strap, aligning the holes; 4) reinsert the spring bar and ensure it is firmly secured. If you lack the tool, a professional watchmaker can complete this in minutes.

Yes, provided the lug width is precisely 22 millimetres. All straps in our 22mm collection are engineered to fit this model flawlessly without modification. We recommend premium leather—cordovan or calf—or technical NATO to ensure durability and aesthetic coherence with the watch's instrument character.

A premium leather strap, with ordinary maintenance (periodic cleaning, protection from excessive moisture), maintains structural integrity for 3–5 years of daily wear. Vegetable-tanned leather develops a natural patina over time, improving aesthetically. On an instrument-grade watch like the 140.030, we recommend having a NATO strap as a backup for situations requiring immediate durability.