I came across this earlier when looking through my first day covers it was inside one of the covers.
It looks like there was a stamp of some sort attached to it at some time and I'm thinking it may have been a Cinderella stamp that was made for this the first Capex in 1951.
I bought a shoe box that was full of loose stamps and about twenty first day covers so it may have fallen off and be in with the loose stamps.
Anyone come across one of these before or know what stamp was attached to it?
Cheers, Bill
