El Bar Americano en España by Pedro Chicote (1927, p.71)

0.33 copitacoñac — Source omits the repeated unit and uses dash shorthand.base
ice — 4 ó 5 pedacitos de hielobase
6 dropsAngostura bitters — Angosturabitter
0.33 copitapipermint modifier
0.33 copitaCointreau — Source omits the repeated unit and uses dash shorthand.other
  1. Agítese muy bien y sírvase en copa de cocktail.

Ice: Ice

Cocktails by Pedro Chicote (1928, p.222) — Pipermint and Cointreau

6 dropsAngostura bitters — Angosturabase
0.33 copitacognac — Conacbase
0.33 copitapeppermint liqueur — Pipermintmodifier
0.33 copitaCointreau other
  1. Shake very well and serve in a cocktail glass.

Ice: 4 to 5 pieces ice

This matters because it preserves a late unnamed house-style aromatic rather than discarding it for lack of a prestige label.

See also: Reverendo Cocktail, Voronoff Cocktail