Maybe I should mention that Lommebogen with some cocktail written down by Axel Sørensen in the late 1930s wasn't published until Dec 2013 by Henrik Steen Petersen. And that only part of the new book can be read online (but including recipe for Copenhagen cocktail 1939 and others)
The is an older variant "Copenhagen Cocktail 1939" from Axel Sørensen's black, bar notebook: 22.5 ml. Beefeater Gin, 22.5 ml Cherry Heering, 22.5 Dolin Rouge Vermouth, approx. 2 dash lemon juice + 1 dash stron sugar syrup, 1 dash Angostura Bitters. Can be read on issuu.com ("Lommebogen" ISBN 978-87-995886-0-2, in Danish only, published by Henrik Steen Petersen from the former "Moltkes Bar" in Copenhagen)