El Bar Americano en España by Pedro Chicote (1927, p.65)

ice — 3 ó 4 pedacitos de hielobase
0.67 copitawhisky base
6 dropsAngostura bitters — Angosturabitter
0.33 copitaleche — Source omits the repeated unit and uses dash shorthand.other
  1. Sírvase muy frío en copa de cocktail y floréesele con un poquito de nuez moscada rallada.

Garnish: nuez moscada

Ice: Ice

Cocktails by Pedro Chicote (1928, p.193) — Nutmeg finish

6 dropsAngostura bitters — Angosturabase
0.67 copitawhisky base
0.33 copitamilk — Lechedilution
nutmeg — Nuez moscada ralladaother
  1. Shake and serve very cold in a cocktail glass, finishing with grated nutmeg.

Garnish: Grated nutmeg

Ice: 3 to 4 pieces ice

This matters because it preserves a cold milk-and-whisky aromatic branch in late Chicote.

See also: Milk Punch, Nana Cocktail