Need help identifying small stamp medal

Hello can someone help me identify what this small medal is? It is representing some kind of stamp.
From what kind of set this is coming from?
Do it have any kind of value?
How old is it?
Sorry many questions

Material Silver .925 with some stamps on the border.
Height 24mm
Width 20mm
Weight 5.1g

Part of a series of six designs ...
'For your consideration is a stunning SOLID SILVER STAMP, in rare MINT condition, based on the original issued within the UNITED STATES of AMERICA during c1845. This beautifully crafted "20-CENT ST LOUIS BEAR", exacted to the finest exquisite detail and measuring 11mm x 9mm, is one of the greatest stamps of the world and a wonderful collectors item or gift for a STAMP or SILVER enthusiast. The "St Louis Bear" stamps were engraved in a plate of six subjects. The need for 20-cent stamps led to a re-engraving of the plate. The denominations on two of the five-cent stamps were obliterated, and the 20-cent value was then engraved by hand. In 1983, the catalogue value for a used 20-cent bear on greenish paper was $9000, while one on lilac-grey paper is valued at $9500.
The stamp weighs between 1-2 grammes and is shown next to a £1 coin for an idea of scale.'


http://picclick.co.uk/SOLID-SILVER-STAMP-USA-1845-20-CENT-ST-LOUIS-282191237619.html

So nice !

Thanks ZacUK it seems quite similar, mine is quite a bit bigger.

The Ebay link provides more info on the actual stamp rather than the small stamp medal.