some kind of example piece to show off a cut die design from just looking at the text on the card, it mentions an exhibition which seems to point towards die cutters showing off what they can do.
Value I would have no clue, I would be fairly certain it is not a precious medal from the fact it is wire hooked to card.
It is a festival of Britain piece I haven't come across yet.
Restoration addict : Verdigris Removal : Zinc White spot removal : Iron Rust Removal : Silver brooch/necklace mount Removal