That isn't the only explicit lie at this museum.
Because not only does it show a "Palestinian coin" that isn't Palestinian, but it also shows a reproduction of a "postage stamp" that was never a postage stamp.
Despite it showing a monetary value, this is not a postage stamp. It was a propaganda stamp (also known as "Cinderella stamps") issued to raise money by Arab nationalists.
One could not mail a letter with this stamp. And anyone could print one.
The Jewish National Fund printed millions of similar "stamps" as fundraisers from at least the 1910s to, I believe, today. No one claims they were "postage stamps."
If their cause is so just, why do they have to lie all the time?
