Just ran across this Atlanta CL listing for a Filter-Flo pair (not matching). Dryer appears to be no newer than 1972, washer is post-1973. Seller is sadly mistaken regarding the age of the pair.
Yeah, they are seriously way off with the age. These are more like 30 years old, or slightly older. I can't see the units very well, due to the small photos, but they look like they are in pretty good shape!