This drink clearly comes from the era of American Prohibition. I found it in the Savoy Cocktail Book, which was published in 1933, so even if this wasn’t its first in-print appearance, it had to be pretty close. This recipe specifically called for Plymouth gin, as well as Kina Lillet. Plymouth is of course still around, but there is some debate as to if the currently available Lillet is the same as was once marketed as “Kina Lillet”. Some evidence appears to indicate that the product was reformulated sometime in the past, and it’s bitterness from the quinine might have been softened at that time.