Description:
Grover Master Plate for perforations. MP102/266 (1928) SR No. 6147 for Lennox Foundary. Stamp description: Record perforating. Size of Stamp: 30.25mm x 24 .5mm; No. of perforations: 21 x 17; Pins: 0.028; Pitch of perforations: .0645" x .0648" .