Comment by dvh
5 years ago
I had Vostok watches with jet fighter and crunchy adjustable outer diving rim, they ran 5 minutes earlier every day. I also had small gray watches with black metal band that just said "quartz" and "sdelano v sssr" and they were off by 1s per month, entire family set time from me.
If you're serious about mechanical watches or have a small addiction like me, I'd highly recommend buying an old school timegrapher and regulating(link below).
I have a rather ridiculous collection of Orients, and some were off by minutes a day from the factory. Just the nature of them, I guess.
I would just offer to regulate them for other people, but I've scratched enough casebacks to never feel comfortable in that.
Link to example timegrapher: https://www.amazon.com/OTOOLWORLD-Tester-Multifunction-Timeg...