This Sanyo vintage walkman is the M-G100 "Sportster", a portable personal cassette player that originally retailed for $119 back in 1983. Its a top-of-the-line unit with metal shell, soft touch controls, and high-tech auto reverse function so you can rock out without stopping to flip the tape over.
Other features include individual left and right volume knobs and separate tone control.
Its shown here complete in its original box with removable belt clip, instruction manual, headphones, and carrying case. 