My interpretation:
1.5 oz Bombay Sapphire
1.5 oz Carpano Antica
1 dash Regan’s Orange Bitters
1 slice of orange, halved.
Shake with ice, strain, garnish with fresh half-slice of orange; serve. — This cocktail recipe appears first in Straub 1913/1914 and then in JM 1916. It is also presumably found, with two slices of orange, under the variant name “Christ Cocktail” in the Waldorf-Astoria Bar Book (1935), which, though published after the Sad Era, purports to contain the correct recipes commonly used before Prohibition.
