There was a set issued by the Royal Mint when the bi metal £2 first came about,showing stages of the minting process, the final coin has 'Trial' on it, they were originally made to test vending machines, probably a set been broken apart to be sold, the set usually sells at around £20/30, where as the blanks fetch more as an 'error' Quite right. I've got a set and it has a sailing ship on the reverse and the queen's head on the obverse. It was dated 1994 and showed four stages of the production process for the £2 coin. interesting! never heard of these, but quick ebay search found this £2 trial piece , I'd quite like one, but not at that price