I know this a bit of a stretch from "sports cards" but I need a little help on 4 diff. 1971 complete sets (each w/8 player discs) from Mattel including: Football 1 & 2, Baseball, and Speed Machines. These sets have an original recorder which pops disks in and out well but doesn't seem to be playing them, unless I have battery D in wrong (?). In general everything has no more than average wear.
How valuable/rare/popular are these things? Any experience with them/info. would be helpful. I tried to research a bit online/eBay but didn't find enough info. Thanks in advance. -Pat
