Impressive amount of research! I see a Jamaican rum version in the comments, which is worth noting. J.A. Groshusko's 1933 Jack's Manual uses Jamaican rum.
Currently, this recipe references Stan Jones's recipe and credits Harry Craddock in 1930. I couldn't find it in the Savoy Cocktail Book. However, I did find it in the 1933 UKBG Approved Cocktail Book. Are you referencing an earlier UKBG recipe?
Also, I found recipes from the Kentucky Colonel in Jacques Straub's Manual of Mixed Drinks from 1913 and Drinks from 1914
The French Connection, Godfather, & Godmother also appear in Brian's Booze Guide by Brian F. Rea, volume 1, 1976. Haven't found anything before that yet.
Credit: Meaghan Dorman from Raine's Law Room NYC circa 2011. A riff on the French 75, it is a favourite of Melanie Asher, a pisco maker and friend of Meaghan. It is named for the Peruvian connection and colour scheme the mix with the Rose Cava creates.