Recently taken a real liking to older folders that I started getting at flea markets and garage sales. I know very little about bikes but I got hooked on these old one and have kind of started collecting. Got 2 Italians marked HYDA BYKE that apear to have been made special for a local, Chicago area, now defunct bike shop, an old German and an early Dahon "HON California". I'm interested in info on how old these bikes may be and any info on finding serial numbers on them or other manufacturing markings and details; where, when, and how many like them were made. Most of all I'd like to find out who else out there has the 70-something folders. My interest is peaked in these older folders and I want to learn more.................Thanks!
PS Info on the HON (I don't think its 70's) would be appreciated too.