Blue one is embossed 7th NIA Convention/Berea, Ohio/1776-1976 and its numbered on the back 185 of 500. Gold one is embossed 6th NIA Convention/San Diego, Calif./July 11-13, 1975 and is numbered 265 of 500. Red one is embossed 9th NIA Convention/Reno, NV./July 21-23, 1978. Not numbered. Green one is embossed 8th NIA Convention/Lakeland, FLA./July 15-17, 1977. Not numbered, All four for $16.00 plus flat rate postage.