[Hantor]

Greetings, fans of precision timepieces! I inherited a gorgeous Seiko wristwatch from my father. I think it’s from the Velatura series, but there’s a small problem with it. It's been sitting in a drawer for years, and I can't figure out how to use the calendar or the chronograph sub-dials. There are so many buttons and crown positions that I’m afraid I’ll damage the mechanism or throw off the hand synchronization. Can anyone advise me on how to correctly set the date and time without damaging the mechanism, especially if it has a perpetual calendar function?

[Hantor]

I also noticed that the second hand has started skipping two divisions at a time. Does this mean the battery is dying, or is it an error in the module's settings? I don't want to take it to just any repair shop near the subway where they might scratch it. Does anyone know where I can find a detailed control diagram specifically for Japanese calibers so that I can set everything up myself at home?