Originally Posted by
T-Mar
No earlier than 1975 on basis of derailleurs. Hard to tell, but front looks like a circa 1975-1977 Shimano 60 while the rear looks like a circa 1978-1979 Shimano 600. Crankset would appear to put it more towards the latter but the serial number will identify exact year.
While the hi-tensile tubing indicates an entry level model, the derailleurs and crankset suggest something more from the upper end of this range. The US models at this level and era were the Liberty and Americana. It doesn't quite match either and may be unique to the Japanese or Asian market.
YOU CAN TELL ALL THAT BY THE PICTURE?! Wow, you're good. You got the derailleur models spot on. It's a Shimano 600 rear and a 60 front. Can't remember what the name on the crankset is. I'll try and get all the info for the components when I work on it a bit more today.
Edit: Well, and the bike in the scans is NOT the same thing as what I have. My bike is high tensile steel and it looks like the bike in the scan has a CrMo decal which I would be willing to guess means it's CroMoly.