1989 Air King problem!

[PaydayMcHaircut]

I have a 1989 (I think) Air King. I wear it pretty regularly, at least once a week usually more. It has been running very well for the last couple of years.

About two years ago I noticed a sort of crunching sound when winding, I set it aside for a few days and weirdly enough it just seemed to stop doing it on its own.

A couple of days ago I noticed it was slow by half an hour which I thought was weird because I had recently wound it. When I started to wind it, the crunching sound had come back again (I say crunching as oppose to grinding as its not a very consistent sound, sounds like there is motion)

Anyway, I wound it anyway (which is probably a bad idea) and I noticed that despite the winding it kept losing time. The strange thing (to me but probably not to those who know anything about watched) is that when I wear it, it loses time, but when I sit it on a table, it stays pretty accurate for a good 12-24 hours.

What can I do? Does it probably need parts? Being that it's a 1989 model will Rolex service it? Am I better going to a non Rolex watch repair place?

Thanks for any help or suggestions anyone can give. I really like the watch but can't really justify spending a ridiculous amount of money on it.

Cheers