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Philatelistische Sachverständige und Prüfer

A.I.E.P. International Association of Philatelic Experts
American Philatelic Expertizing Service (APEX)
Associazione Periti Filatelici Italiani Professionisti
Bund Philatelistischer Prüfer e.V.
Confederate Stamp Alliance Authentication Committee
Experts - The Royal Philatelic Society London
Expert Committee « Royal Philatelic Society of Victoria
Fakes, Forgeries & Experts Journal
International Society for Japanese Philately
Mexico-Elmhurst Philatelic Society International
Philatelic Experts
Philatelic Stamp Authentication & Grading Inc.
Professional Stamp Experts
The Philatelic Foundation
The World Index of Stamp Forgeries