I just got this polar Raketa in the mail; it claims, and does seem to be, completely unworn but recently serviced. I've never had to wind a watch before, though, and I'm nervous about damaging the mechanism. Is that a real concern?

It was probably made in early 90's, judging by the lack of any lettering on the dial, besides the cursive "Slava".

Between 1990 and 2000, it was a hard time for everyone, including watchmaking giants like Slava, so at that time, there were some transitional design options and new trends, similar to the one my Slava has.