George V (1910-1936), Trial in cupro-nickel for the proposed shape of the Edward VIII Threepence, 1936, bare head left, rev. date within six-sided star, ROYAL MINT TRIAL DIE, 21mm, 3.31g/12h (Dyer p.22). Almost as struck, extremely rare £3,000-5,000

The Royal Mint only have a rubber impression of the obverse and reverse