Ostende Fizz

Harry of Ciro's ABC of Mixing Cocktails by Harry of Ciro's (1923, p.66) — Harry of Ciro's 1923

1. Shake well and strain into a medium sized tumbler.
2. Fill the balance with syphon.

This matters because it preserves a fruit-liqueur fizz branch far from the better-known gin and whiskey lines.

The key point is the sparkling treatment of cassis and kirsch rather than of a base spirit plus citrus.

Barflies and Cocktails by Harry McElhone and Wynn (1927, p.60) — Barflies 1927

1. Shake well and strain into a medium-sized tumbler.
2. Fill the balance with syphon.

This matters because it preserves a small Franco-Belgian fruit-spirit fizz branch in McElhone's field.