Adrian,
I have only just seen your posting from January...
I can state that I have also been trying to acquire this item since the show in 2006, but have never seen it offered for sale or even illustrated anywhere as a single "stamp", other than on Piotr's website.
BUT....
My archive of worldwide dummy imagery shows that the 'stamp' was used at least three ways at the show, as the (poor) pics below illustrate. Maybe it does not exist as a single label or in counter sheets, but only on these MS. Nice items, but I am still no closer to acquiring them!



GLENN