1 1/2 ounces gin
1 1/2 ounces sweet vermouth
1 dash orange bitters
1 teaspoon Benedictine
Stir the gin, vermouth, and bitters with ice. Strain into a cocktail glass and then float the Benedictine on top.

This drink was named for a member of the family which founded the Guion Line, a steamship company which operated from 1866 to 1892 and was one of the primary steamship lines providing transportation from London to New York. This drink was probably created at the Waldorf Astoria bar.