my vista elite has date codes like ec (1980 march) with some from 1979... nice shimano 600 parts mostly.

the cranks have only a date code and no part number like the later 6200 etc.. the wheels are dated EC and the rear has one of those early 6 speed cassettes with the wrench of bottom cog. The hubs also have little holes in the center (grease ports) but the cover clips are long gone??

States made in Japan with a serial number stamped on the side of the down tube.