British Coins, Elizabeth II, VIP proof sixpence, 1956, laur. head r., rev. cross of interlaced rose, thistle, shamrock and leek (cf. S.4149; cf. ESC.1838 K; Bull 4533), certified and graded by PCGS as Proof 64, very rare
The only example graded PF64 by PCGS
(500-600 GBP)