Reorder No. printed in white on the back of the cartridge
Pat. No. imprinted into the back of the ribbon cartridge
Printed in white on the back of the cartridge beneath the reorder No.
"Medium brown nylon" is printed in white on the back of the cartridge. There are also two spools on the cartridge with directional arrows. The box for the cartridge indicates that it is for an "IBM Selectric Model 72 Typewriter". 9/16" x 12 yards of Nylon ribbon contained in the cartridge.