I just got the first 1970 cassette release from Japan today in the mail of BRIDGE OVER TROUBLED WATER (Simon and Garfunkel).......
www.discogs.com/release/4975436
One thing interesting is it is on BLACK TAPE.. I have several Ampex 8 tracks that have black tape also but Ampex is the only one that used this stuff.......
The newest cassette I have with black tape is my 1985 ZZTOP cassette "Afterburner" (New Zealand release)