El Bar Americano en España by Pedro Chicote (1927, p.130)

0.5 wine-copitacoñac — 1/2 copita de las de vino de coñacbase
ice — 3 ó 4 pedacitos de hielo picadobase
0.5 wine-copitaagua natural — 1/2 copita de las de vino de agua naturaldilution
jerez — Lightly sprayed over the drink.modifier
nuez moscada rallada — Added at service.other
1 coffee spoonazúcar en polvo — 1 cucharada de las de café de azúcar en polvosweetener
  1. Stir with a spoon.
  2. Lightly spray with sherry, add a little grated nutmeg, and serve in the same glass with straws.

Garnish: Sherry spray, nutmeg, and straws

Ice: Crushed ice

The printed ingredient line says coñac under the Gin-Sangaree heading; preserved as printed pending later source audit.