Motorcycle Repair: Z50 identification, motorera, bill silver

Question
I bought what I believe to be a 1970 Honda Z50A. The steering stem tag is missing. I have searched high low for serial numbers on the net and have come up empty. The serial number on the frame is Z50A-220501 and the engine is Z50AE 212964. Can you tell me the model,(KO, K1??) year, and build date?
Thanks Mike

Answer
Mike,

http://www.motorera.com/honda/h0050/z50a/z50a.htm

It looks like it is a 70-71 K1 version, from the above webpage.

See also: http://www.oldhonda.com/z50a.htm

http://www.hondaminitrail.com/z50.html

http://www.hondaminitrail50.com/

Doubt that the build date can be derived from the serial number, until you find another one from a close numbered sequence with a build tag.

Bill Silver