Watch List notes:

(x) Isle of Man, colour trial 50 pence, ND (1972), serial number A 000000, purple and pink, Elizabeth II at right, triskeles at centre, Stallard signature, (IMPM 508ct, Pick 28act, TBB B105at), perforated, red SPECIMEN overprint, uncirculated and scarce.

Estimate: £150 - £200