George III 1779 Guinea fourth head

George III (1760-1820),gold Guinea, 1779, fourth laureate head right, legend GEORGIVS. III. DEI. GRATIA. toothed border around rim both sides,rev.crowned quartered shield of arms, date either side of crown, legend M.B.F.ET.H. REX. F.D.B. ET.L.D.S.R.I.A.T ET.E. weight 8.28g (Schneider -; Bull EGC 698; MCE 383; Farey 1190; S.3728).Once cleaned with multiple surface marks, a bold fine, scarce date