Books say it's a Curtiss Robin.
To narrow down the exact type, this plane looks pretty much like the long-range "C-2" version but it probably isn't.
The engine is definitive a Curtiss Challanger, that funny double-row six cylinder radial engine.
Most probably this is a "C-1" version and it's indicated that it could be reg. no. N325K, in that case the picture would have probably been taken in Torrance, California.
Note that the N325K registration has been reused since, the last plane I know of carrying that registration was a North American T3J/T-39 Sabreliner in 2001.
Best regards - Mike