^Lot 1448 Panama, cob 1/2 real, Philip II, assayer P to right and assayer M below monogram, mintmark AP to lef

Panama, cob 1/2 real, Philip II, assayer P to right and assayer M below monogram, mintmark AP to left, extremely rare, NGC AU 53, finest known in NGC census, ex-Richard Stuart, Plate Coin in COAC 1988, Proctor, and Calico. S-AP2; KM-1; Cal-133. 1.61 grams. Deep dark toning on a broad flan with nice full cross-lions-castles, full but doubled monogram with bold mintmark to left, assayer P to right, and second assayer M below, much legend, one of four varieties for this unique double-assayer issue, this one with large lions and obverse legend ending in retrograde D followed by a dot (Plowman-MR.PM.B, four known). Pedigreed to the Richard Stuart collection and to the Freeman Craig auction of November 1981 (lot 442), also Plate Coin in multiple references, as follows: Figure 2 of The Coinage of El Peru (proceedings of the ANS Coinage of the Americas Conference, October 1988, in a presentation by Barry W. Stallard); HR.1PM on page 115 of The Forgotten Mint of Colonial Panama (2005), by Jorge Proctor; page 84 of Numismatica espanola (2019), by Calico (noted on label).
Please use this link to verify the certification number