Old Transparent Plastic Audio Cassette With Brown (ferric Oxide) Tape For Domestic Magnetic-tape Reader.Similar Cassette Were In Use In 1960-1990. Sometimes It Was Used As An Alternative Computer Storage Medium Like Floppy
Ferric tape reel end (short) - Tapeline Ltd
Ferric tape reel end - Tapeline Ltd
1975 Scotch High Energy "Super Ferric" Type 1 Cassette Review - A 45 year old Super Ferric? Really?! - YouTube