Watch List notes:

10 Units Special Trial Design , struck in aluminium or white metal, Obverse: SPECIAL TRIAL DESIGN around 10, UNITS below, Reverse: similar but with a C inside the loop of the 0, Plain edge, 4.31 grammes, GVF, we note a similar example was sold in the J.Tansley Collection DNW September 2005 (Lot 479, hammer price £50) where it was stated to be the only example extant outside of the Royal Mint, this example of a slightly different weight so clearly a third example, Extremely Rare

Estimate: 50-75 GBP