Very fruity and well-balanced rather than dry or sweet.
The recipe previously on this page was in line with that in the 1977 Jones' Complete Barguide:
50ml...
Looking forward to the definitive Difford's Park Avenue recipe. Love the site, glad I could help in a small way by bringing Haigh's recipe to your attention.
Many thanks, Clarence. I've just revisited it. Hopefully, you find the above an improvement. 60ml (2oz) gin was a tad too spirit-forward so I dropped back to 50ml (1 2/3oz) plus added the all-important bitters.
The version is Ted Haigh's Vintage Spirits and Forgotten Cocktails is 2 oz. gin, 0.75 oz. sweet vermouth, 0.75 pineapple juice, 2 tsp. Curacao. That version is a 5+ stars in my book. The only reason I don't return to it as often as other stalwarts like the Manhattan and Martini is that I don't have pineapple juice and Curacao in stock at all times.
Many thanks, Clarence. I've adopted Ted's recipe above. Having just made both versions I feel there's a middle way that I look forward to finding with further experimentation. I can see bitters and/or saline solution playing a role in future renditions.
I think bianco vermouth would be so far from the original as to be another cocktail but I have revisited and adjusted the recipe thanks to your comment drawing my attention to this cocktail. I've also added to its history.