Watch List notes:

Mexico City, Mexico, cob 4 reales, (16)38/7P, rare.S-M19; KM-unl (38 for type); Cal-unl (Type 275).13.37 grams.Solid and uncorroded but crudely struck, with most of the design flat yet the last digit of date (and overdate) clear, one nice castle and left 1/3 of crown, good toning, brownish sediment in crevices, scratches near periphery on reverse. From: Concepcion, sunk in 1641 off Hispaniola
($150-225)