L'Art du Shaker by Dominique Migliorero (1925, p.49)

0.33 partgin — Ginbase
2 dashorange bitters — Orange bittersbase
0.33 partFrench vermouth modifier
0.33 partItalian vermouth — Vermouth Turinmodifier
2 dashwhite creme de menthe — White mintmodifier
  1. Stir cold and serve.

The source attributes this to Guido of the Royalty Bar, Monte-Carlo.