Is it a St. Edward's Crown watermark stamp? Sheet markings can be used to determine the printer. This looks like a guideline. The length and the fact it appears offset from the left would indicate Waterlow. The somewhat "runny" lines of the printing appear to be the ink whiskers Gibbons mentions as typical for Waterlow as well.
All have. De La Rue have them in the sheet margin. They can incur on the stamp, but are short and should be on the extreme of the stamp, or show a vertical, or horizontal bar if they incur. Waterlow had these in the centre and centrally on each side of the sheet, but inside the sheet margin.
So, your stamp appears to be from row 2, position 10 of the counter sheet.
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Posted 11/05/2021 11:33 pm
