I always wondered what the licensed by Starr SA meant on some boomboxes, they must have been using this mech for a long time even Tanashin was using it. Billboard 1974
Found this transport on Amazon.jp, oddly the store for the brand is dishware. https://www.amazon.co.jp/VINTORKY-テ...けの動き-カセットデッキの仕組み/dp/B0CNYB8VZ5#productDetails
These come from China with a Tanashin Part Number, I wonder if that's where people get the connection? I don't remember a new dual deck. https://www.ebay.com/itm/389440391518 New TN-21 Movement TN21 Dual Card Cassette Deck Tape Recorder Repeater