El Bar Americano en España by Pedro Chicote (1927, p.79)

1 coffee spoonkirsch — Kirschbase
Seltzer water — Cold seltzer waterdilution
0.5 copitaDubonet modifier
  1. Build in a vermouth glass with kirsch and Dubonet.
  2. Fill with very cold seltzer water and serve.

Chicote notes that the same aperitif can also be combined with curaçao, Byrrh, or lemon.