Folding clasp

A folding clasp or deployment clasp or deployment buckle is a device used to close a watch strap.wikipedia
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Watch strap

watchbandstrapstraps
A folding clasp or deployment clasp or deployment buckle is a device used to close a watch strap.
Watch straps may close with a buckle or a folding clasp.

Clasp

Folding clasp, a device used to close a watch strap