Watch List notes:

British Coins, Elizabeth II, trial farthing, type of 1954-56, struck in aluminium, normal bust r., rev. wren, SAMPLE FARTHING (Peck -; cf. S.4159), virtually mint state, exceedingly rare
A most interesting and rare item, the word SAMPLE is where the date would be. This is the only one we have seen.
(400-600 GBP)