The Stone Mountain commemorative was minted in large numbers and some were released into circulation, which accounts for the wear on this 1920's coin. The Booker T. commemorative was issued from 1946-51, and mintages varied; over one million were minted in 1946, with some being released into circulation as they were not all sold to collectors. Only 6,000 Booker T.'s were produced at each mint (P, D, S) in 1947, however, so you've got a rather rare one there.
Now that makes sense. There was no Walker made in 1925 and the Stone Mountain was produced in 1.3 million. This one above was used as a walker. I think it is at least as pretty as, if not prettier than, a circulated walker.