I'd actually say this is like a sweet-ish digestif cocktail. Nice and sweet with the mandarin liqueur I used (in place of the Curaçao). The brandy mostly went missing, though maybe if I sub in some Cognac, it could be better. I did use a sugar rim, since I was worried about how dry it might have been without it.
I think this cocktail needs way more citrus, the first time i tried this with the recipe above and i found the Maraschino too overpowering for my taste, also too much sweetness.
I recently made it again with 25 ml of lemon juice and the result was a very nice, balanced drink, essentially a Sidecar with subtle cherry/almond notes from the Maraschino.
Looking at the original Savoy recipe I note Craddock specifies orange curaçao rather than Grand Marnier so I have amended the above recipe accordingly. Obviously, please select your choice of orange liqueur according to personal preference.