Watch List notes:

(g) MS63 | France, Louis XVIII, Second Restoration (1815-1824), 20-Francs, 1817-A, Paris (Gad. 1028; Mazard 659; Schlum 136; Fb. 538), extremely fine, in NGC holder, graded MS63 (Cert. #5879414-004) [Grade 1 of 7; Three Finer].
https://www.ngccoin.com/certlookup/5879414-004/63/
Estimate: £300 - £400