these were pretty common back in the day as I remember it. I sort of loved/hated cassettes - most of what i listened to was on tape but depending on the brand there were all sorts of issues with them. BASF shed a lot of oxide on to the heads requiring constant cleaning. The dirty orange color of the labels was almost a warning to stay away. I seem to remember TDK being the most consistently reliable. ...so why would anyone want to collect them?