||William & Mary tin Farthing 1690, S-3451, KM466.1, AU58 NGC. Copper plug at center, as made. Porous tin with deterioration around the plug on obverse, very little wear, the reverse retaining much of its original appearance, brighter than the obverse, with Britannia well defined and the date clear. The Royal Mint's tentative experiment with tin, and then tin with an added plug of copper, proved fatal. The humidity of London and much of the country caused a rapid spoiling of the metals. Within five years of the first issues, copper replaced tin as the metal used for planchets. Almost all known examples of the tin coinage are in wretched states, with only a small number being fairly well preserved. In fact, most have long since perished. Rare.
Realized $1,116.25. Description courtesy of Heritage Auctions.