Originally Posted by fabricioplato

I didn't realize that Tange had changed their format to yy.m,but that is what it appears to be. Your frame could be either a 1993 or 1994 and there's a possibility that the C10 in the S/N indicates 1993 October. Of course, this assumes the fork is OEM. There's always a possibility of it being a replacement, given that it's chrome but the date code fits with the original estimate and some Nishiki road bicycles were spec'd with chrome forks in the early 1990s, so I'm assuming it is OEM.