Café Royal Cocktail Book by W. J. Tarling (1937, p.194)

0.4 partgin — Ginbase
0.3 partZubrowka base
0.2 partsweet vermouth — Martini Sweet Vermouthmodifier
0.1 partsilver water — Silverwasser (der Lachs)other
  1. Shake.
  2. Pour in Zubrowka after shaking and add Silverwasser.

Invented by Tony O'Connor.