Actually this is a silver .999 art bar made by Jerry Parker at the end of the 60's ... early 70's ... there are about 27 différents stamps that have been reproduced this way ... It is actually very neet !!
In additionnal information, 25 were reproductions of Canadian stamps and 2 are supposed to be reproductions of US stamps ... the "Washington credo" and the "Frigate Constitution". Actually I do have the 25 reproductions of the Canadian stamps ... I am looking to find the two US ones. This is an interesting project that brings back a lot of memories !!