The Old Pal Cocktail, according to The New York Bartender's Guide recipe I used, combines rye whiskey, Campari and sweet vermouth. Apparently other versions use dry vermouth instead. I have no idea who the "old pal" is but the drink first appeared ABC of Mixing Cocktails, a 1922 book written by Harry MacElhone.
To me, the flavor resembles that of a cranberry. The Campari brings the bitter (and the color), the vermouth the sweet and the whiskey the warmth. My wife enjoyed it so we may try this one again. Maybe I'll try with dry vermouth next time.