In the legacy of Coach, the turnlock is an unassuming yet omnipresent detail.

That little piece of brass hardware can be found across handbags, clutches, tote bags, duffels and crossbody pouches by the New York fashion brand. But its origins have little to do with fashion: in 1964, Coach designer Bonnie Cashin took the toggle that secured the roof of her 1940s convertible and put it onto bags, and the rest was history.

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