G.B.P.S. line-engraved plating gauge. _ 1 photo.: b & w ; 78x65mm 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.IV, Die 1, Plates 132 to 175 alphab. Published by G.B. Philatelic Publications Ltd. in 1980. Publication and catalogue information, links to buy online and reader comments.