I don't know, but I can tell you my Gap has the same seat stay caps, same brake bridge, and I think the same fork crown. I don't remember the details of the lugs and BB but I think they are the same as yours. The brake cable treatment on mine is different, though, and it has an outrageous paint job that may suggest a slightly later date than yours. Anyway, the serial number on mine ends in 93, from which I conclude it is a 1993 model. I don't remember where I got the idea that the serial number reflects the date; it could be completely bogus. But right or wrong, I think the overall style of the bike is consistent with that date.

That said, check out this thread:
http://www.bikeforums.net/showthread...-serial-number

As for your paint, scary as those blisters are, I doubt the frame has been weakened, but I wouldn't store it outdoors. Too good to repaint, if that's what you were thinking.