This is my Sinn 104. It's one of the most accurate automatic watches in my collection (+0.5 -to +1 sec per day). It's on a watchgecko leather strap. Hugely reliable and solid without being too heavy. For a 41mm watch, it sits very small on the wrist, so I can wear it.
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Amazing watch!
Great watch indeed. Mine keeps time well within COSC specs as well, and I love the legibility.