I think it all comes down to price, but I wouldn't really sweat it. Speaking of sweat, I would ask the owner if they used it in a trainer. That may be the culprit or that type of rust pattern. My guess is that some of that will just wipe off and then a little judicious work with some super-fine steel wool will take care of the rest.
My '90 MB1 has rust edges around the headtube, and have had them since I bought the bike (not the original owner...) I can see no flex in the paint and so far it's remained on my über-sloth list of "get to someday" The top tube corrosion is probably the one I'd deal with. Don't have a Rom color match here, but clear is always a choice - http://www.cyclofiend.com/rbw/color.html The one thing I would absolutely do if I bought it would be to drop the fork and pull the headset cups and make sure there isn't any old saltberg hiding in the headtube. best of luck! - Jim / cyclofiend.com -- You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group. To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bunch+unsubscr...@googlegroups.com. To post to this group, send email to rbw-owners-bunch@googlegroups.com. Visit this group at http://groups.google.com/group/rbw-owners-bunch. For more options, visit https://groups.google.com/groups/opt_out.