BRITISH COINS FROM OTHER PROPERTIES, Miscellaneous Trials and Proving Pieces, Special Trial Design, 10 Units, c. 1970, in aluminium or white metal, special trial design around 10, units below, rev. similar, but c inside the loop of the 0, edge plain, 23.5mm, 4.28g/12h. Very fine and extremely rare, believed the only specimen extant outside the Royal Mint (£40-50)

Provenance:
Joanna Tansley Collection, DNW Auction 67, 28 September 2005, lot 479