Casio Databank CD-40 (1984)
While you couldn’t exactly call it a smartwatch by today’s standard, the Databank was a trailblazer in wearable tech. Casio had already made watches with calculators in them, but this was the first to include a ‘databank’ which would hold up to 10 phone numbers right there on your wrist. Wearable digital storage in 1984? Yes please.
(Image credit: pocketcalculatorshow.com)