Cocktails Bar La Florida by Constante Ribalaigua Vert (1934, p.143)

0.5 partgin — Gordon ginbase
2 dashesorange bitters bitter
0.5 partdry vermouth — Noilly Prat vermouthmodifier
  1. Do not shake; chill, strain, and serve with an olive.

Ice: Cracked ice

The Artistry of Mixing Drinks by Frank Meier (1936, p.33)

0.5 partdry vermouth — French Vermouthbase
0.5 partgin — Ginbase
  1. Stir well and serve.