Café Royal Cocktail Book by W. J. Tarling (1937, p.146)

1 dashlemon juice acid
0.5 partgin — Seager's ginbase
0.3 partdry vermouth — French vermouth, Cuseniermodifier
0.2 partkummel — Wolfschmidt kummelmodifier
  1. Shake.

Invented by A. R. Gower.