Harry of Ciro's ABC of Mixing Cocktails by Harry of Ciro's (1923, p.79) — Giro's Club London
| 0.5 glass | Calvados | base |
| 1 portion | gin — The OCR measure before gin is compressed; kept as a small spirit portion rather than over-normalized. | base |
| 1 portion | Grenadine — Source shows a compact measure marker before grenadine; preserved conservatively as a small portion. | base |
| 0.5 glass | Italian vermouth — Cinzano Vermouth | modifier |
- Shake well and strain into cocktail glass.
This matters because it preserves a named Giro's Club London house drink rather than only imported classic lines.