This is a Certina watch strap 18mm at the lugs to 16mm at the buckle it's blue and padded 3mm to 1.5mm  padding,the long part is 11.5 cm and the short part is 7.5cm not including the buckle, blue leather with blue matching stitches, the strap is from the 70's in excellent condition for vintage Certina watches, buy with confidence.

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please look at the pictures carefully before you buy, what you see is what you get