Set of 14 different vintage AMF "Magic Triangle" Bowling Center postcards, 9"w x 6"h.  Includes 12-20 Bowl in Gary, IN; Bel-Aire Lanes in Detroit; First Boston Ten Pin in Dorchester, MA; Riviera Lanes in Melrose Park, IL; and Thunderbird Lanes in Troy, MI.  Postcards were issued to announce the AMF Automatic Pinspotters in the 1940's.