Watch List notes:

George III (1760-1820), Third-Guinea, 1799, first laureate head right, rev. crown, date in legend, edge obliquely milled, 2.78g, 12h (Murdoch III, 109[b]; Selig 1069; MCE 451; Spink 3738), an outstanding example of this key date of series, virtually mint state, very rare thus.
Provenance
From the Hayleigh Collection
, ,
NGC MS63+ (Certification #5879380-002) [Top Pop]
, https://www.ngccoin.com/certlookup/5879380-002/63/
Estimate: £800 - £1,000