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Stamp Collectors Against Dodgy Sellers
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Expertizing

Articles

Peter's Expertization article Updated - November 2012

Simon Dunkerley's "Aspects of Philatelic Expertising" articles:

Part I - Overview, what to expertise and why
Part II - Gum, perfins, reperforating, missing colours
Part III - Provenance, expertising markings, extensions, resources

G. Kock's list of Philatelic Experts