Quote:
Originally Posted by Peter_Spaeth
Trade secret.
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Even the great ones get caught and their methods exposed.
https://d2jf3tgwe889fp.cloudfront.ne...8pp147-163.pdf
https://en.wikipedia.org/wiki/Jean_de_Sperati
https://en.wikipedia.org/wiki/Franço...(stamp_forger)
Some of the Sperati and Fournier stuff so devalued the originals that the forgeries often sell for more.