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Received my manual wind sparrow hawk yesterday, set the time, wound it until I felt resistance in the mainspring. I woke up this morning to find that the watch hadcstopped at 5:30 am. That's not 12 hours of run time on a winding.
It's been a LONG time since I've had a hand wound watch, but this does not seem right.
Please leave some feedback on the power reserve that should be expected.
Power reserve should definitely be more than 12hr. Haven't checked mine yet, but all my other watches with ST19 movement get at least 48hrs. Not sure what you mean by resistance, but you should wind until you can't wind anymore.