
via this auction
"Approx. 15 7/8” wide x 11” deep (including knobs) x 6 3/4” tall (including steel bracket -- 5 1/8" tall without). Total weight: 15 lbs.
DESCRIPTION:
Rare, vintage drum machine.
Chamberlin Rhythmate model 20. Serial #4151. 14 tape loops, each loop with 3 different prerecorded drum tracks on it. Volume and tempo controls. Power indicator light. Single RCA jack on back. New 9 volt battery and 1 amp fuse included. (Note that this model does not have an internal speaker. Use an RCA to 1/4" plug to play through your guitar amplifier.)

Circa mid 1970s (assuming the wiki article below is accurate), but the technology definitely belongs to the 1950s-60s. USA.
According to the wiki article below, fewer than 700 Chamberlins (comprising all models) were made 1951-1981, with fewer than 50 working examples accounted for today. "













The pictures are incredible!
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