Description:
Grover Master Plate for perforations. MP102/487 (1944) SR No. 8734 for W. W. Sprague & Co. Stamp description: Postage stamp coupons. Size of Stamp: 20mm x 20mm; No. of perforations: 9 x 9; Pins: 0.043; Pitch of perforations: .0875' x .0875" .