Reference 33, Secret Marks and Technical Differences of Baht Values in the Eighth Series of Thai General Revenue Stamps.

This is a reproduction of an article written by Alan Cameron, in The Thai Times, published in August 2002, page 33-37. All copyright belongs to the original author.

The article is updated by Jos Sanders in October 2024 to add the gained knowledge during the period after the original article was written. Major change is that some of the printings done by De La Rue, are actually done by Harrison & Sons. This is corrected by handwriting.

Also, the sheet with the secret mark information coming from the De La Rue archives has been added at the end of Alan's article.

Please click on the link below to see the full article. 

TR TT August 2002 secret marks

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