Michael J. Fox is documented wearing the Casio Collection. Each watch below links to its strap size and story.

Casio Collection 1989

As Marty McFly he wears the CA-53W calculator watch in Back to the Future Part II (1989) and Part III (1990); in the first film he wore its predecessor, the CA-50.

18 mm

Most common strap size on this line: 18 mm

Source: Wikipedia, Time and Tide

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