ftnpro said:
Shazam nailed it. The stamp sheet features a FAKE picture of Jim Henson with Kermit in silhouette. Any long time Muppet fan is familiar with the actual photo of Jim Henson holding a Bert puppet.
It's not fake, the artwork was based off the famous picture of Jim and Bert, but just cause it was based off that and is not 100% that does not make it fake. No it is not the actual photograph but it is still a great image of Jim and Kermit based off the artistic concept of the famous one of Jim and Bert. It is still great!
Plus since Bert is owned by Sesame Workshop and these are stamps of The Muppets it would not have been possible to use a Bert image.