Odd button from garden

[Number774]

I found what appears to be a button while weeding yesterday.
It's an inch in diameter, and made of a copper alloy - I suspect bronze. It looks as though it may have been gilded - some parts are still quite shiny. It _could_ have been mounted on an iron pin in the centre of the back, but this is corroded away.
It has on it what looks like the Warwickshire Bear and Staff, surmounted with a crown. I could try and photograph it - but I don't really have a suitable camera.
As background our garden is old enough that bits of clay pipe turn up; and there was a WW2 bomber base half a mile away.
Any ideas?