This may in fact date to earlier than 1950’s as Marvin came out of the Army in 1946 & started working as a Hog & Cattle buyer. This mechanical pencil is all kind of awesome, great condition graphics, subject matter & working. Vintage Early 1950 Advertising Mechanical Pencil Marvin Mcbride “Hog Buyer” & General Trucking Nevada, Iowa Working Condition Awesome