Great Britain: 1912-24 1d in a black proof sheet of 200 (20x10) for coils.
Printer: Harrison & Sons Ltd.
Medium: Surface printed
In 1913 it was decided to issue stamps in coils or rolls from vending machines. The stamps in these coils were made up of a series of strips of ten affixed together.
The usual number of stamps in a sheet was 240 being 12 by 20. A special printing plate was made for the purpose of producing coils of stamps, it being of 200 stamps, 20 by 10.
The public never saw these special sheets. The item exhibited is a proof in black from the special plate marked in red to show small flaws in the printing.