I'm always on quest to find straps to accessorize with my watches. For my Sinn 103 Klassik 12, I found a Barton Canvas Strap in Linen color which I believe makes for a nice close color match to the "chamois" color Sinn describes being used in the ceramic bezel insert numerals, as well as, the lume color tone. It's both casual and tooly and a quality strap to secure this 60th Anniversary Limited Edition watch to my wrist comfortably.
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That Sinn looks eff'ing amazing!!!