A must for plate number collectors! Lists and prices mint and used plate number singles from 1890 through 2023 issues. Includes regular issues and commemoratives, coils, booklets, modern die-cut-omitted issues, airmails, special delivery, parcel post, duck stamps, expanded back-of-the-book issues such as postage due, postal savings, war savings, modern officials, offices in China, revenues, stock transfer, wine and cordial, tobacco tax stamps and much much more. Listings for specialists in siderographers' initials, plate finishers' initials, hand-entered offset plate numbers, ZIP, Mail Early, Copyright, Pane Position Diagrams (PPD), 5-point / 6 point stars / C / CS / EI markings on flat plate issues, more! Includes PNS for Allied Military Government / AMG issues for France, Italy, Germany and Austria. Listings for overprinted U.S. issues for Guam, Puerto Rico, Philippines, complete listings for Canal Zone including overprints and CZ issues.