Strap for Pilot's Watch 857 S UTC

The Sinn 857.020 is equipped with a 22-millimetre lug width. This measurement represents the distance between the two lug attachments (the terminal pins) and is the correct parameter for selecting a compatible strap. Always verify the lug width by measuring directly on the case before purchasing a replacement strap.

For the 857.020, we recommend materials that emphasize the technical nature of the instrument: alligator in dark tones (brown, black) for formal elegance, vegetable-tanned leather for a patina that evolves over time, NATO Premium for resistance and waterproofing in operational environments, or grooved rubber for aquatic sports. The choice depends on the intended use and desired aesthetics.

The 857.020 uses standard lug attachments with 22mm width. To replace the strap: carefully remove the old strap by extracting the spring bars from the lug attachments using a dedicated tool (spring bar tool); insert the new strap by aligning the lug width to the attachments; verify that the spring bars are fully inserted into the lugs. If unsure, consult a professional watchmaker.

Yes, any strap with a 22-millimetre lug width is compatible with the 857.020. However, the construction quality and material of the strap influence durability and wearing comfort. Artisanal straps, such as those produced by Milano Straps, guarantee superior finishing and increased longevity compared to industrial alternatives.

A natural leather strap with vegetable tanning, worn daily, maintains structural and aesthetic integrity for 3-5 years under normal conditions. Lifespan depends on frequency of use, exposure to humidity, sweat, and sunlight. Rotating between multiple straps and regular maintenance (cleaning with a damp cloth, natural drying) significantly extends the useful life of the strap.