Here's a nice shot of the first four "wthballs" custom postcards trimmed to size, given FREE with each of the next four issues of "wthballs" magazine.
The 1974 Willie Mays postcard is available now buy purchasing a copy of the "1974 Missing in Action" magazine (#6), with the other postcards available with each subsequent issue.
These art-cards are issued as 4" x 6" postcards that can be cut to size if you like. Or keep them at full-size if you prefer!