The rocker boxes seem to be more like Wrights.
The finning is relatively thick.
It's from the back row of a two row engine - the pushrods and ports are on the same side.
What is the bore? Any part numbers?
Pratt & Whitney R-2800-52W,-54 rear cylinder
There are no fin restricting strips on the cylinder in the first post, so it may be earlier than the 52W/54.