L'Art du Shaker by Dominique Migliorero (1925, p.35)

0.33 partgin — Ginbase
2 dashorange bitters — Orange bittersbase
0.33 partdry sherry — Dry sherrymodifier
0.33 partFrench vermouth modifier
2 dashOrgeat syrup — Orgeat syrupsweetener
  1. Stir cold and serve.

The source attributes this to H.-C. Harrison, London.