Hi, I have recently come across this piece, and have absolutely no idea what it is. I picked it up, because presumably - due to the age - it is silver, and so would be worth around £1 in scrap. I will keep it if it's worth a little more, though; I acknowledge that it has a hole in it, but am just curious of what it is.  I can tell you that it is not in "collectors coins GB", or in any of my other books, but it has the Britannia on it so surely it is British? Please help!