The Old Waldorf-Astoria Bar Book by Albert Stevens Crockett (1935, p.74)

1 teaspoonlemon juice acid
0.67 partsloe gin base
0.33 partdry vermouth — French vermouthmodifier
  1. Build and serve cold.

Crockett says the name predates the wartime song.

Café Royal Cocktail Book by W. J. Tarling (1937, p.207)

0.67 partgin — Ginbase
3 dashesorange juice — fresh Orange Juicebase
0.33 partsweet vermouth — Martini Sweet Vermouthmodifier
2 sprigsmint — tender Mintother
3 dashesGrenadine — Grenadinesweetener
  1. Shake and strain into cocktail glass.

Lineage reconciliation