Sinn
Instrument Chronographs 103StSawanted— lug 20mm
Sinn Instrument Chronographs 103StSawanted: 20mm strap. Alligator, box calf, shell cordovan and rubber, cut and stitched in Milano. Choose your leather.
Artisanal Note
"This model requires a precise 20mm lug width to preserve the original sartorial balance."
Technical Specifications
Sinn 103StSawantedThe essential strap measurement.
Browse 20mm straps →103StSawanted
ETA caliber 7750 Hours, Minutes, Small Seconds | Date, Day | Chronograph
The Heritage
Compatible Straps
Selected for the 20mm lug width of the Instrument Chronographs
FAQ
What is the lug width of the Sinn 103StSawanted?
The Sinn Instrument Chronographs 103StSawanted features a 20-millimetre lug width. This measurement is determined by measuring the distance between the base of the first lug seat to the base of the second lug seat, passing through the maximum diameter of the case. The 20mm width is standard for professional chronographs and determines compatibility with all aftermarket straps.
Which strap is most suitable for the Sinn 103StSawanted?
Three solutions are recommended: 1) Natural alligator with vegetable tanning (taupe or black) for formal elegance and visible ageing; 2) NATO nylon in grey-blue for operational contexts and versatility; 3) Black synthetic rubber for marine or industrial environments. Your choice depends on intended use: formal daily wear suggests alligator; operational settings favour NATO or rubber.
How do you change the strap on this chronograph?
Strap replacement on the Sinn 103StSawanted requires a spring bar tool: 1) position the instrument on a watchmaker's pad or workbench; 2) using a plastic or steel tip, press downward the small pin of the spring expander; 3) the lug releases from its seat; 4) extract the previous strap; 5) insert the new strap, aligning the pins with the seats; 6) the spring resumes its locking position automatically. Operational time: 2–3 minutes per lug.
Is an aftermarket strap compatible with the Sinn 103StSawanted?
Yes, provided the lug width is precisely 20 millimetres. Milanostraps supplies 20mm straps in alligator, calf, NATO and rubber, specifically engineered for this measurement. Compatibility is guaranteed: each strap is tested with standard spring bars. We recommend verifying that the strap possesses correct locking seats (distance between spring holes: approximately 18mm).
How long does a leather strap last on the Sinn 103StSawanted?
A natural alligator strap with vegetable tanning, worn daily, retains full functionality for 3–5 years. Longevity depends on: frequency of use (daily versus occasional), ambient humidity (dry climates extend lifespan), and maintenance (monthly cleaning with damp cloth). Smooth calf presents slightly lower durability (2–4 years) but accepts recolouration easily. NATO nylon straps exceed 7–10 years without failure. Synthetic rubber lasts 5–8 years before hardening.