Part of the problem here is that it is different for every country, every town, and for different time periods.
I have a very expensive used Iceland stamp with an overprint where the mint stamp was worth a few bucks and used worth a few thousand (at the time). On overprinted stamps you need to determine if the overprint is real or forged and then if the cancel is over the overprint as a starting point - relatively easy.
It initially was thought genuine by one of the most knowledgeable dealers in Scandinavian material. He sent it out for a certificate prior to making an offer. The certificate came back that the overprint was genuine and the cancel was made with a genuine cancelling device from that town. But the cancelling device of that type was only used in earlier years for that specific town.
Extensive research and reference material is required for this type of research - you might want to narrow your topic somewhat.
To start you might want a book like this;
Album Weeds
You can also download the entire Album Weeds book from the Stamp Smarter Library.
http://www.stampsmarter.com/learning/Home_General.html
Don
Hello Everyone. I am a constantly research driven. I would like to start a thread discussing the telltale signs of postmark forgeries. What to look for. Red flags. What are the clues to being genuine. I have heard many things, like stamper type, ink type, wether it flows off the paper or edge. Any input from you would be so great. The more the better. Thank you.
re: Telltale signs of Postmark Forgeries.
Part of the problem here is that it is different for every country, every town, and for different time periods.
I have a very expensive used Iceland stamp with an overprint where the mint stamp was worth a few bucks and used worth a few thousand (at the time). On overprinted stamps you need to determine if the overprint is real or forged and then if the cancel is over the overprint as a starting point - relatively easy.
It initially was thought genuine by one of the most knowledgeable dealers in Scandinavian material. He sent it out for a certificate prior to making an offer. The certificate came back that the overprint was genuine and the cancel was made with a genuine cancelling device from that town. But the cancelling device of that type was only used in earlier years for that specific town.
Extensive research and reference material is required for this type of research - you might want to narrow your topic somewhat.
re: Telltale signs of Postmark Forgeries.
To start you might want a book like this;
Album Weeds
re: Telltale signs of Postmark Forgeries.
You can also download the entire Album Weeds book from the Stamp Smarter Library.
http://www.stampsmarter.com/learning/Home_General.html
Don