From Southmeadow Fruit Garden catalog.
“HOOPLE’S ANTIQUE GOLD - A russet-skinned sport or bud mutation from a standard Golden Delicious tree in the orchards of Mr. Harry Hoople of Hoople Fruit Farm in Otway, Ohio. This is one of the most beautiful apples we have ever seen with a russet skin of amazing antique gold coloration. The flavor is also of extraordinary merit and indeed its universally favorable reception from those who had tasted it was the reason Mr. Hoople sent it to Southmeadow for propagation. Hoople’s Antique Gold varies from the original not only in beautiful skin color but in crispier flesh and intensity of flavor. We are most grateful he has enabled us to make this superb new variety available to fruit connoisseurs. Season same as Golden Delicious.”
Whatever it is, it’s an excellent find. And I agree with their assessment of its beauty.