Watch List notes:

BRITISH COINS, MILLED GOLD SOVEREIGNS, Victoria, Gold Sovereigns (3), 1874, 1876, 1878, young head left, ww buried in thin truncation in relief, rev St George slaying dragon with sword, horse with long tail, date in exergue, tiny b.p to upper right (Bentley 309, 310, 311; Marsh 87, 88, 89; MCE 538, 539, 540; S 3856A). Generally scuffed with surface marks and hairlines, the first two cleaned with rim nicks, second with rim bruise on reverse, otherwise generally good fine, last very fine. (3)
Calendar year mintages 520,713; 3,318,866; 1,091,275 respectively
The 1874 Calendar output is very low, and is only marginally more than that of 1839. There was no issue of London mint Sovereigns in either 1875 or 1877.

Estimate: £550-650