Duchess Cocktail, as printed in The Old Waldorf-Astoria Bar Book, 1935, a collection of Pre-Prohibition, Classic Cocktails.
Duchess Cocktail (Waldorf-Astoria)
1 dash of orange bitters
1/3 absinthe
1/3 French vermouth
1/3 Italian vermouth
Stir in iced mixing glass and strain into chilled cocktail glass.
The Old Waldorf-Astoria Bar Book