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On this page we offer straps for Swatch Sistem 51 Watches. This type of Swatch does not use spring bars like a regular watch; but it has a 19.8mm notched watch strap which is held in place by a metal bar for extra solidity. The ends of the straps are notched so that they fit into the corresponding shape of the watch case. Only the straps on this page will fit a Swatch Sistem 51 watch.