Variety 12-P-1: Heath Counterfeit Detectors varied from edition to edition, and noted Numismatist Eric P. Newman, whose collection this particular Counterfeit Detector is from, developed a classification system to compare and describe their variety. This particular variety is described as follows: Twelfth edition on typeset title page; Pocket size; 1877 copyright date; REVISED has been added above the last line of the gold lettering on the front cover; Printed by the PRESS OF ROCKWELL AND CHURCHILL, 39 ARCH STREET, BOSTON; Elaborate engraved title page with 11 different styles of lettering is in front of the typeset title page; A complete revision of the text; Advertisement of the American Bond Detector eliminated; 1877 date on typeset title page; 6 chapters on 35 pages followed by 14 pages of advertising and recommendations; There are 7 numbered plates containing the right half of the faces of United States Notes and National Bank Notes up through the $100 denominations printed from transfer dies made by the Bureau of Engraving and Printing from original plates with a thick black line from the lower left to the upper right across the notes on the first three plates and from the upper left to the lower right across the notes on the last four plates, the printed signatures of A.U. Wyman, John C. New and John Allison appear on some notes; Chapter VI has a description of the illustrated notes; a new single illustration of the microscope glass is surrounded by the text.
Front inside cover: EPN classification sheet with book designation and description.
Heath's Infallible Counterfeit Detector at Sight by Authority from the United States Treasury Department Revised Pocket Edition
Press of Rockwell and Churchill, 39 Arch Sreet, Boston
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Illustrated with entire new plates of both greenbacks and national bank notes. The only infallible method of detecting counterfeit, spurious, altered bank notes and government bonds, as now in circulation or that may be issued, applicable to all banks in the United States and Canada, with genuine designs from the original government plates, by authority from the United States Treasury Department