"MPP-B" is handwritten after "paper" on the label at the top. "MFT-P" is handwritten after "pen no." on the label on the top. There is a plastic dust cover protecting the object with a "Monroe" label.
Monroe Calculator Company
||Stamped into metal plat attached to rear
overall: 9 3/4 in x 18 3/4 in x 17 7/8 in