Watch List notes:

(g) Fine Details | George III (1760-1820), 'Military' Guinea, 1813, sixth bust, by Marchant, edge chevron milled, 8.26g, 12h (Murdoch III, - cf. 158 [Proof]; Schneider II, 613; MCE 404; S.3730), removed from a mount with resultant damage at 12 o'clock and polished surfaces, otherwise an affordable example of this desirable date, fair to fine, in NGC holder, graded Fine Details ~ Mount Removed (Cert. #5878606-011).
https://www.ngccoin.com/certlookup/5878606-011/Details/
Estimate: £300 - £400