Watch List notes:

(g) France, Fifth Republic (1958-present), gold Proof 500-Francs, 1997, 'Pierre and Marie Curie', .920 AV, 17g (Fb 687; Gad. 2), brilliant uncirculated, very rare, only 300 examples struck, in fitted case of issue, with certificate of issue no. 221.

Estimate: £520 - £600