^Lot 1545 Great Britain, medium-sized copper alloy Admiral Vernon medal, 1739, Vernon / Porto Bello, unique di

Great Britain, medium-sized copper alloy Admiral Vernon medal, 1739, Vernon / Porto Bello, unique dies, ex-Adams. AC-unl. 10.25 grams; 33 mm. Olive-gold AXF with bright brassy highlights around details, weak rims, rare size and a new variety with unrecorded dies (both sides) that evidently were never encountered throughout literally centuries of research and publication, now proposed by Adams to be PBv52AAA XRF: 48.84% copper, 47.20% zinc, 2.87 lead. Pedigreed to the John Adams Collection (with his handwritten tag).