Sinn
104 St Sa I MG
Ref. 104.0131
· 41mm · caliber Sellita SW220-1: Swiss automatic, ETA 2836-2 functional equivalent, 28,800bph, 26j; day and date, the day-date sibling of the SW200-1
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Mid-tier supplier movement
Medium-large: suits wrists 6.5 in+ (16.5 cm+)
41 mm case. 20 mm lug width. Wears confidently on average to larger wrists. May overhang on slender builds.
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Authentication
Sinn is not a meaningful counterfeit target, and the 104 is one of its most straightforward watches. The checks worth doing are about the movement and the bezel, not about the watch being genuine.
Known issues in the market
- The 104 carries a bidirectional pilot's bezel, not a unidirectional dive bezel. A 104 that only turns one way has had its bezel or its click spring changed.
- The Sellita SW220-1 drives both day and date. A quickset that advances the date but not the day, or the reverse, is a movement fault rather than a variant.
- The metallic-green dial is specific to the 104.0131. A green 104 offered under any other product number is a different watch or a mislabelled listing.
| Area | What to check | What is correct | Red flag |
|---|---|---|---|
| case | Bezel rotation | Turns in both directions with a defined click through the full rotation | Rotation in one direction only, or a bezel that turns freely with no click |
| movement | Caliber SW220-1 day and date quickset | Both day and date advance independently from the crown and change fully at midnight | Either indication failing to quickset, or a changeover spread over more than a few minutes |
| dial | Metallic green surface and printing | Even metallic green across the dial with crisp white printing and no bleed at the edges | Blotchy or dulled areas, which on a watch this recent usually means moisture ingress |
| crown | Screw-down crown and 200m seal | Crown threads cleanly and seats fully; the 20 bar rating depends on it | Cross-threading or a crown that will not seat, which is both a fault and a water-ingress risk |
Common legitimate replacements
- Straps and bracelets are swapped routinely on a 20mm lug width.
- Crystals and crown gaskets are ordinary service parts.
Expert resources: Sinn services its own watches in Frankfurt and will confirm a product number. Any watchmaker familiar with Sellita calibers can assess the movement.
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Buying guidance
Source for this entry: sinn.de
Pre-purchase sheet → The numbers to check, what to look at and what to ask, on one printable page.