Sorry, I'm over-late in responding to this thread. There was a playoff basketball game tonight I couldn't miss

Anyways, I tried photographing my stamps for a comparison of original gum vs regummed. However, they look terrible, so I've resorted to borrowing from a website.
Along with the photos, I've borrowed a couple of paragraphs as well ...
"The stamp on the left has been regummed and the one on the right has original gum. If you look closely, you can see the 'feathering' of the perfs on the stamp with original gum and traces of the 'after market' gum on the one on the left."

Here's a close-up of the two stamps:

"Another sign that a stamp has been regummed is if you lightly run you finger across the perfs and they feel stiff or sharp, it is a good indication that the stamp has been regummed. What you should feel is the "feathering" of the perfs from having been separated without any extra gum having seeped into the paper fibers. Again, keep in mind that stamps were perforated AFTER having been originally gummed. This method is not foolproof but, after you gain some experience in detecting the presence of regumming, you will get a feel for it"
Here's another example ...

These are only a couple of examples of regummed stamps. Not all regummed stamps look the same. Some are very good. The best advise I can give is to get a feel for the real thing. Once you get a feel for that, detecting fakes will become relatively easy.
Brian
http://reviews.ebay.com/A-Guide-to-...000006269808