23 vintages used cassette tapes
These are UNTESTED cassette tapes. 
Conditions vary from fair to very good as far as my eye can see, but they have not been played on a cassette player or tested in any way.
4 Maxwell bias 90
1 maxwell bias 60
1 TDK bias 120
2 TDK bias 110
3 TDK bias 90
4 Sony bias 90
2 Memorex bias 90
1 Memorex bais 60
1 Philips bias 60
1 Fuji bais 90
1 Kmc bias 60