It freaked me out when I went the post office today. I couldn't tell if it was a real stamp or some elaborate forgery.
And notice the pun, too. The "forever stamp" picks up on the word "forever" in the Proclamation (though you have to juggle "henceforward" and "thenceforward" to get there).
My U.S. Flag 'Forever' stamps say 'Forever.'
Why it is a pun to put 'Forever' on an Emancipation Proclamation 'Forever' stamp?
I don’t buy stamps much anymore, (goodbye USPS) but if I do, I’ll get some of them. Who knows with the way things are going. That 45 cent ‘forever’ stamp may be worth $100 before long. ;~))