AP Diver 15710 white dial

[improviz]

Well, in your case it sure sounds like they could have done a better job with attention to details, I will grant you that. 10 sec/day to me is nothing, as I rotate watches and have absolutely no case over the course of any given day where being within ten seconds of anything is important, and if I need to-the-millisecond accuracy I've always got the iPhone in my pocket.

Sometimes it seems that people raised on quartz accuracy expect it from mechanical watches, and to me this is misplaced sentiment, these are different devices with different inherent levels of accuracy. However, it's good that your friend was able to adjust the watch to your satisfaction, you definitely want to be satisfied with your purchase.

Hopefully this all was just a blip for you and you can enjoy them moving forward.