When I first bought this watch, it was four minutes slow every day. So I returned it. The second is 18 seconds a day. I decided to keep it because it's quite unique and I like the look. A speed of a few seconds is tolerable. Update on this watch: The mainspring broke after five months, rendering the watch unusable. I tried not to rewind but it didn't matter. I liked the look of the device, but it's cheap. You get what you pay for.
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