Watch List notes:

G Elizabeth II, gold proof fifty pence, 2017, Sir Isaac Newton Issue, head r., wearing tiara, rev. an interpretation of elements of Newtons Proposition 11 from Book One of Principia Mathematica, wt. 15.5gms. (S.H48), in case of issue, with certificate, FDC
One of only 500 issued.

Estimate: 650 - 750 GBP