Watch List notes:

George V (1910-36), Official Silver Jubilee Medal, 1910-1935, in gold, by P. Metcalfe, 57mm., 123.13g (Eimer 2029a; BHM 4249), hairlines in otherwise brilliant fields, very rare in this metal with only 99 pieces struck, in Royal Mint case of issue.
Brown notes that the large gold medal strikings originally numbered 99 pieces in fine gold, and were originally marketed for 50 Guineas each
Estimate: £4,500 - £5,500