Café Royal Cocktail Book by W. J. Tarling (1937, p.201)

5 dashesAngostura bitters — Angostura Bittersbase
0.4 partbrandy — Brandybase
0.2 partFernet Branca — Vernet Brancamodifier
0.4 partkummel — Kummelmodifier
  1. Mix and strain into cocktail glass.