Can't comment on the duarbility of the nail polish. I just finished assemblying the bike with LOTS of touch up using the polish. It came out pretty well but the match is not exact. Much better than rusty scrapes though. Captain blight, the fork appears to be italian. the steerer tube is marked 26.5mm which is an italian size for lower bearing ID. I can barely make out additional stampings "SPIRNER" and a logo that looks like a bird (quail or dove).