Looks like a Piper J-5 to me.
P.Clawson did a PA-12 and claims it to be a J-5C but it has a fully inclosed cowl like on a PA-18. I want to call his model a PA-12 Cruiser.
J-5's are rare in real life and P.Clawson's model is the only reference I have seen for a J-5.
It would be nice to see someone make a J-5, the one with the cylinders exposed.
P.Clawsons may very well be a J-5 "C" which may be the designation for a PA-12 Super Cruiser, I don't know, but it does have the single pilot seat and wide tw-place rear bench seat like the J-5 I remember seeing with the exposed cylinders. So too does the PA-12 Super cruiser have the same seating arrangement.
A Piper J-5 with the exposed cylinders and the bulged fuselage sides is a very attractive "cute" thing to admire. I don't believe FS modeler ever made one.
Anyway that's what the plane in the picture looks like to me.
edit: Oops! just saw the second picture. Now that looks like a Piper J-4.
J-5's are pretty with exposed cylinders
