As you can see from the pictures (red=ANCOOL, black=OEM), 1) ANCOOL straps are slightly shorter than OEM, 2) ANCOOL straps are smooth while OEM have tiny bulges , 3) the ANCOOL buckle is slightly grayer than black, and 4) the clips that attach the strap to the watch have a different clasp but work the same way. The strap material feels the same. Not a bad option if you're looking for a different color to complement your watch.
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