I recently picked up this letter with what would be a very rare stamp on it if it's real. I bought this for relatively little, presuming it was a forgery for a variety of reasons.
I know some people actually collect forgeries from some of the more famous forgers.
Just curious if people are familiar with this one?
My guess is someone took an old letter an affixed this stamp to it after the fact. Aside from the postmarks on the envelope appearing to be much later than would be expected (1856), and the extensions of the cancellation lines onto the envelope looking like they were added after the fact, is there something glaringly obvious about the stamp itself that stands out?
*Edit* I added a photo comparing it to an original for reference.
Thanks in advance for any feedback.