Corpse Reviver #4

From Wikipedia entry: This recipe was a new variation at the Savoy's American Bar that employed Fernet-Branca as an ingredient, coming almost two decades after the corpse reviver appeared in the Savoy Cocktail Book with its #1 and #2 variations. Salvatore Calabrese states in his book Classic Cocktails that it was created by Johnny Johnson of the Savoy circa 1948, and lists it as a corpse reviver #3. Others believe it was invented later in 1954 by Joe Gilmore, also of the Savoy.

Besides Calabrese, the Fernet version is sometimes categorized by others as the corpse reviver #3, but it is not standardized and it is sometimes referenced as the №4.