25mm Copper Die Trial. Very rare, scarcer than the copper nickel version! 1957 in star/Brittannia striking coins. Inscriptions: 1957 ROYAL MINT TRIAL DIE/BRITANNIA MONETA. A rare trial coin, but we got a great deal, and pass the savings on to you! This coin is sooo close to Uncirculated! Photo is of actual coin. As of 8/2010, price reduced from $49.50 to $40.