Watch List notes:

Isle of Man, James Murray, Proof Silver Penny, 1758, crowned monogram, rev. treskelis, chevron grained edge, 6h, 12.17g (Spink 7410a), some faint contact marks under magnification, otherwise with pleasingly cabinet toned surfaces, extremely fine, one of only 47 struck, thus extremely rare.

Estimate: £900 - £1200