Watch List notes:

Foreign Coins, The Walker Collection, Chile, Carlos IV, 4 reales, 1791/0 DA, Santiago, transitional type, laur. bust of Carlos III r., rev. crowned arms (KM.38; Cal.889, but overdate unlisted), tiny edge nick above head, otherwise very fine or better, extremely rare
A rare three-year type and, with the overdate, only a single specimen listed in Coin Archives (first sold in UBS Sale 1991, lot 294, from the Garcia and Tarapaca Collections).
(800-1200 GBP)