Originally Posted by
typhhon
Nishiki Olympic. Serial number is GM740786 and another code below it shows HA12. I'm guessing mid-eighties on a date. Other than a few nicks in the paint, scuff on the seat corner and a third of the decal on the headtube missing it almost looks like new.
My only concrete point of reference is the 1987 Olympic 12. While the frame has many similar features, notably the cable tunnels under the top tube, the 1987 had fade paint. Typically, panelized paint schemes preceded fade paint schemes, but your bicycle also has a Unicrown fork, while the 1987 used a standard crown. The unicrown fork puts it's later. Based on the serial number, logo and unicrown fork, it appears to be a 1988 model manufactured by Giant in late 1987.