^Lot 1560 Great Britain, copper alloy Admiral Vernon medal, 1739, Vernon and Brown / Porto Bello, unique, ex-A

Great Britain, copper alloy Admiral Vernon medal, 1739, Vernon and Brown / Porto Bello, unique, ex-Adams. AC-unl. 12.99 grams; 38 mm. Near AU details but with light oxidation throughout (especially on edge), dark in color and low in contrast, but evidently a new and unlisted variety (Adams proposes calling it PBvb1AA) that is a muling of obverse PBvb1 with reverse PBv42RR. XRF: 60.73% copper, 37.14% zinc, 1.56% lead. Pedigreed to the John Adams Collection (with his handwritten tag).