Here's a reduced image of that photo, which as you can see is a bit wrinkled and also a bit of a parallelogram, so the edges are at a slant. I see from Jim Maas's Squad-Signal book about the Buffalo (p. 22) that this is Royal Air Force Buffalo W8131, completed early December 1940. It's a Model 339E with "armourglass" behind the windscreen and a ring & post sight that will eventually be replaced by a Mark III optical gunsight. "The white civil registration," Jim wrote, "is a temporary marking carried for flight tests and acceptance trials."
I assume that the airfield is near the Warminister/Johnsville plant that Brewster built near Philadelphia.
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