Game-Master
Reference: 775.90X
Serial number: NA
Year: 1976
Movement:
The Supersport is fun and colorfull. But the quality is bad with lots of plastic and illfitting parts.
This is long before the quarts crisis so why Heuer made such cheap watches - I don't know.
The red and black are ref. 775.902 and the one with the rotating bezes is ref. 775.901 M.