Crop of the same photo ( original size 8"x10" contact print) I cannot tell what color the body of the aircraft is, either O D green or blue, the wing is yellow as is the tail.
XPT-7 Mohawk, have no idea what this A/C is, U.S. markings, I was more interested in the O-25 in the background, 1930 photo looks like a proposed trainer.( ebay package purchase, personal collection)