Rare 1960s advertising brochure for vintage Curta calculator. Original, not a copy. Four pages printed on heavy paper, about 8 inches high, 5 inches wide. Authorized reprint of Curta calculator operation from the book "Larry Reid's Guide To Rallying". Includes photo of the Curta and its operation. Gives an in-depth review of the Curta and its applications. Brochures like this were sometimes distributed by Curta dealers as a marketing tool. Almost no wear, appears new.