Watch List notes:

George III (1760-1820), oval countermark upon Spanish Four Reales of King Charles III (1759-88), 1778 DA, struck in Santiago, Chile, small oval hallmark of George III right at centre of obverse, bust of Spanish King laureate and draped right, date below with stop either side, legend and toothed border surrounding, CAROLVS.III. DEI. GRATIA, rev. crowned quartered shield of arms, pillar with ribbon incuse motto either side PLUS VLTRA, legend surrounding, .HISPAN. ET IND. REX. S. 4R. D.A., mint letter with o above, weight 13.47g (Bull 1878 R5; ESC 611; S.3767). Toned, host coin very fine, reverse better, countermark good very fine and extremely rare.

Provenance:
Ex Barry Pritchard Collection of Halfcrowns, Baldwin Auction 57, 23rd September 2008, lot 557.

The initials D and A at the end of the reverse legend represent the names of the Mint Assayers who were Domingo Eizaguirre and Augustin de Infante y Prado.