El Bar Americano en España by Pedro Chicote (1927, p.67)

ice — Unos trocitos de hielo picadobase
6 dropsAngostura bitters — Angosturabitter
0.33 copitaamer-Picon — Source omits the repeated unit and uses dash shorthand.modifier
0.33 copitavermut francés modifier
0.33 copitadry pin — Source omits the repeated unit and uses dash shorthand.other
  1. Agítese muy bien y sírvase muy frío en copa de cocktail.

Ice: Ice

Cocktails by Pedro Chicote (1928, p.205) — Picon-gin-vermouth version

6 dropsAngostura bitters — Angosturabase
0.13 copitadry gin base
0.33 copitaAmer Picon modifier
0.13 copitaFrench vermouth — Vermut francesmodifier
  1. Stir very well and serve very cold in a cocktail glass.

Ice: Cracked ice

This matters because it preserves a Picon-led aperitif branch with only small measures of gin and vermouth in Chicote's late field.

See also: Picon Cocktail, Perfecto Cocktail