My interpretation:
1 oz Casa Mariol Vermut Negro
0.5 oz Fernet Branca
0.5 oz Jack Rudy grenadine
Fill glass (12 oz) with broken ice, shake well / frappé 30 seconds, strain into cocktail glass, serve. — A fine aperitif Trio

An amateur mixologist prepares and assesses the cocktails and miscellaneous drink recipes in Jack Grohusko's mixed drinks manual.
Greetings! We have come to the end of the Cocktails section from Jack’s Manual (1933). In the process of our study, we have discovered so...