Classic Alarm watch from the late '60s.
Before the existence of quartz alarm watches, which started to come around in the late '70s, These are the answers from various manufacturers. Mechanical alarm watches.
Operation is simple, you wind up the alarm, set the time you want it to go off by turning the crown, then pull out one click on the top button. That's it. When it goes off, the real 'bell' inside will ring and also cause the case to vibrate, by the moving hammer knocking the bell.
However, the alarm wont last long, typical between 10 to 15 seconds, that's all. So, don't count on it if you need to get up early in the morning.
Eric has been a gadget lover for decades and had been collecting affordable vintage since the nineties. With his passion for vintage watches, he had been sharing thoughts and photos in interest groups, with his intention of raising public interests on forgotten classics.