G.B.P.S. line-engraved plating gauge (1 photo. : b & w : 85x65mm) in pocket.
The Plating of the penny 1840-1864 : a tabulation of the measured positions of the check letters and other relevant data arranged for easy plate identification. Vol.V, Die 1, plates 176 to 204, reserv. Published by G.B. Philatelic Publications Ltd in 1984. Publication and catalogue information, links to buy online and reader comments.