Reportedly created during Prohibition at the swank Los Angeles "Embassy Club" (opened 1929), this drink languished in more modern times, and was dusted off by Paul Harrington for the late 1990’s website that he was providing classic recipes for. It’s use of orange bitters made it difficult to re-create until those became more available.
Shake with ice.
Strain into a cocktail glass.
Source: “The Savoy Cocktail Book” (1930) by Harry Craddock