Looks like a Snipe to me. Old design with reverse transom 15.5 ft long
3 things going against that theory:
1. Snipe was not made by Johnson Boat Works - a lot of other builders but JBW is not listed in Sailboatdata
2. Snipe had a daggerboard, the boat in the photos clearly has a centerboard that swings into position. The shape more closely matches the shape shown in Sailboatdata.
3. The shape of the rudder in the photos more closely matches the rudder shape shown in SBD for the X Boat.
The hull & rig looks very similar, I'll give you that! But the bottom of the boat in the photo looks like it is flatter, like the X Boat, while the Snipe looks like it has more rocker. The one detail that throws me off from the X Boat is that the hull should be 6' wide and the boat in the photo seems to look narrower, like it could be 5' (that would be the dimension of the Snipe). I think it is the head-on photo that may be creating the illusion of a narrow hull, though. The photo from behind does appear that it could be 3' from centerboard to rail. The deck next to the cockpit definitely looks wider in the photos than it does on the Snipe.
They were first built within a year of each other (1931/1932) so it is not surprising that they look so similar. Perhaps the X Boat was a midwest knock-off of the Snipe, with wider deck & flatter hull in the model of the scows that JBW built for midwestern lakes.