original checklists printed on cardstock...one card is black with printing in off-white...designed to be visible under all allied aircraft lighting systems...currently in use red (US), amber (UK), ultra violet (all branches)...the black L-4J is dated June 15, 1945...the white cardstock L-4J is dated April 10, 1953...both measure 5" x 8"...excellent condition...sold as a set