Plate Number on the Sheet Selvage Illustrated
Scans courtesy Mark Bloxham Stamps
a. Line-Engraved
Plate numbers in all four corners of the sheet
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For line-engraved sheet markings see Seymour and Hill page 94
b. Surface Printed
Plate numbers at top right and bottom left of the sheet
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For surface-printed sheet markings see Beaumont and Easton pages 323 to 333
For the current number on the selvage go here