This has not been tested. May or may not work.
All Transistor Portable Tape Recorder MS 504 Made in Japan Untested Display
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I haven't tested the earpiece. This is a very rare and unique item. Made in Japan. It has the original box.
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MU128 Wyoming Portable Reel to Reel Tape Recorder Prop Rental
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Vintage Portable Reel To Reel Tape Recorder FOR SALE! - PicClick UK
MU128 Wyoming Portable Reel to Reel Tape Recorder Prop Rental
All Transistor Portable Tape Recorder MS 504 Made in Japan