Old Pal

The Old Pal Cocktail first appears in "ABC of Mixing Cocktails" by Harry MacElhone of the famed Harry's New York Bar in Paris. Originally calling for Canadian whisky, an American rye provides a robust flavor profile that adds a great foundation for the dry vermouth and Campari. Next time you are at your favorite bar, cozy up to the Old Pal Cocktail.

Old Pal

Garnish: Lemon twist
Stir with ice. Strain into a cocktail glass.
Source:
In the ABC of Mixing Drinks, Harry lists Canadian Whisky instead of Rye for this drink.