I'm going to revisit this again.
Kevin, here is what I'm referring to....I know you're a well-known dealer and I've purchased from you in the past, and have a lot of respect....but can't believe that by looking at a image (and not a great image) that you can tell that it's a genuine 243.

A shaved down card proof, when it was maybe damaged, could be a possibility, india or other, and if faulty and tampered with, at 1/10th or 1/20th CV, wouldn't be worth much of anything.
I only mentioned that if the OP was going to sell the stamp, he should certify it..just wanted to clarify....thanks, Ray