This is Casios first alarm watch from 1977. A rare and hard to find model, the all stainless case is pretty unusual for Casio - a round, almost cushion like shape with a large, open dial that has relatively little lettering (for Casio anyway) and an understated pattern that can only be seen if you look closely. The excellent band with seven inner links is unusual as well. On the display you can choose to show the seconds or the date at the far right and the alarm icon is one of the biggest I've seen on any Casio.

WATCHES WITH MODULE 25

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