For your consideration, here is a 1967 SCM Calculators Advertising 6 Inch Plastic Ruler Calendar, for a salesman in Olympia, Washington.  It has a little wear on it.  It will be mailed in a bubble mailer with foam core stiffeners.  Item pictured is the actual item up for sale, and comes from a non-smoking household.  (667.7b16d-.4ob)