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strictly for informational purposes.
Fakes and Forgeries: Worldwide (Search “Stamps, Fakes and forgeries”)
Album weeds : or, How to detect forged stamps https://archive.org/details/albumweedsorhowt00eare/page/n15/mode/2up 
Stamp Forgeries of the World https://stampforgeries.com/ 
APS: Forged or Genuine? https://stamps.org/learn/forged-or-genuine#google_vignette 
Philatelic Fakes and Forgeries https://en.wikipedia.org/wiki/Philatelic_fakes_and_forgeries 
Identifying & Collection Fakes & Forgeries https://www.pennypost.org/pdf/ForgersPresentation2018.pdf 
Philatelic Foundation https://www.philatelicfoundation.org/educational-resources/fakes-and-forgeries/ 
Classic Stamp Forgeries https://stampforgeries.blogspot.com/2021/03/fiume-1918-1924.html 
Worthpoint: Stamp Forgeries https://www.worthpoint.com/dictionary/p/stamps/collecting-approach/stamp-forgeries 
World Forgery Catalogue https://www.filatelia.fi/forglinks/forgery-catalogue.pdf 
Books: Fakes, Counterfeits & Bogus https://www.pbbooks.com/fake.htm  
Classic Stamp Forgeries https://stampforgeries.blogspot.com/ 
     (Index for above)  https://stampbears.net/thread/6812/classic-stamp-forgeries-sforgca-index.html
Comparative Stamp Forgery Identification Site https://web.archive.org/web/20091026234233/http://geocities.com/claghorn1p/ 
Forged Stamps  https://www.filatelia.fi/forglinks/forged-stamps-a.html 
If you add a country name ("stamp forgeries, Japan"), you generally get more targeted links.
Examples for Japan https://japanstamps.org/2020/11/02/meet-the-forgers/ 
https://isjp.org/forgeries/ 
http://forgeries.info/countries/japan.php 
Stamp Forgeries (USA)
Faked and Altered US Stamps  https://stampsmarter.org/Learning/ID_FakedandAlteredStamps.html 
Swedish Tiger US Forgeries  https://www.theswedishtiger.com/forgeries.html 
US Counterfeit and Altered Stamps  https://stamps.org/Portals/0/Reference Collection/Ref_Counterfeit_Altered.pdf