The chronological list of the 100 "must-haves" making up The Museum Collection book features this Hy. Moser model at number 8. The excerpt taken from the text points out that its additional functions put it on the same technical level as pocket watches, thus enabling the wristwatch to build up a better reputation among customers.
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Enter the calendar
the earliest wristwatch with multiple calendar complications, this model proved
that small timepieces wearable on one's arm could be equipped with the same
functions as the bigger pocket watches.
33 mm, thickness 10 mm.
hinged back cover, snap-on back.