1739 Admiral Vernon Medal. Porto Bello Medals with Vernons Portrait Alone. Copper. 27 mm. Adams-Chao PBv 43-TT, M-G 74. Rarity-6. Plain Edge. MS-62 (NGC).Superior quality for a Vernon medal regardless of type, this is a smooth, hard and satiny example bathed in rich antique copper patina. Well struck with sharp detail to virtually all design elements, both the preservation and eye appeal are suggestive of a Choice Mint State grade.