Advent 201 Cassette Deck Tape Deck Vintage Audio Recorder Model 201 Vintage
Unicom 201 Rockwell International Slide Rule Calculator w/ Case Vintage Works
UNICOM 201. It has 5 functions, 20 keys, and a VFD (vacuum fluorescent) display. The power source is 4xAA batteries. Unit has typical scuffs and scrapes from use. Vinyl case is clean.