^Lot 1570 Great Britain, copper alloy Admiral Vernon medal, 1739, Vernon and Lezo / Porto Bello, extremely rar

Great Britain, copper alloy Admiral Vernon medal, 1739, Vernon and Lezo / Porto Bello, extremely rare, ex-Ferrari, ex-Chao, ex-Adams. AC-PBvl9H. 10.73 grams; 38 mm. Dark but very sharp UNC with nicely dentillated rims that are missing a few pieces (as made), a variety so rare that AC gives no rating and says "McCormick-Goodhart was unable to locate an example of this variety so it is, by definition, rare." Also, "Medina notes that this was the first variety to be published [in 1749]." XRF: 48.59% copper, 47.49% zinc, 2.90 lead. Pedigreed to the John Adams Collection (with his handwritten tag) and to the Fernando Chao and Jorge Ferrari Collections.