Royalist

Royalist: 1 1/2 ounce dry vermouth; 3/4 ounce bourbon whiskey; 3/4 ounce Benedictine; 1 dash peach bitters; Shake with ice and strain into a chilled cocktail glass.; Source: The Café Royal Cocktail Book (1937), by W. J. Tarling

A nice twist on a Manhattan style of cocktail. It uses dry vermouth instead of sweet, but the Benedictine provides the difference, along with some interesting extra character.