The text "OHC 750"" stamped on the side cover stands for Overhead Camshaft 750cc, referencing Yamaha's real-world four-stroke parallel-twin sportbike released in 1972. This specific green model with yellow accents on the fuel tank was manufactured in Hong Kong during the late 1970s and early 1980s by brands like Zee Toys / Zylmex (as part of their Ridge Riders series).