That's a 21j movement and while some lasted, some are quite problematic. Good thing is the movement is cheap if it need replacement.
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I try to stay away from the 7750. Among the movement we have in reps, 7750 is the least reliable. However some watches esp chrono model are available with 7750 only so you dont really have a choice if you want them. Avoid changing date/day manually during 2100 - 0300.
You are probably confused, ETA as a company, which produce both mechanical and quartz movements.
If its a quartz, its probably going to tick. There are some quartz movement which doesnt tick but they are rare and the usage in reps are even rarer.
AFAIK, that is nothing special. ZF is a factory/group of people who assemble the parts ordered from various build-to-order suppliers. Noob, H-fact, BP etc are all operating similarly at different scales.
well.. he sounds semi-ok to buy from, at least he is not advertising something 1:1 best swiss! kind of bs.
But I will still go with silix for cheapies.