Reminds of this hifi store in Germany that I went to in the mid 80's. It had every Nakamichi deck of that period on display in a room. What a glorious sight that was.
Teac made a closed cassette with internal reel to reel back in the mid 1980's in types I, II, & IV. As did Yamaha type IV, Eico type II, III, & IV, Hitachi types II, & IV and lastly BASF in type IV ( 1987-88 only). Smaller firms like Magna type II, EFG type II, Digitech type II, RCA Victor types II, & IV, National tape type I, Eagle type II also made reel to reel closed cassette blanks. Of course non held a candle to Teac's O'Casse open cassette changeable reel to reels for novelty. I have tons of Teac type IIs,, Eico type IVs , and a couple of Teac Cobalt type IVs that I've been recording some of my Vinyl to with my RX-202. Funny thing is, I personally prefer my plain Jane BASF CR Max type IIs, Denon HD type IIs, and TDK SA type IIs for sound.