It's obviously a variant of the Lockheed Constellation.
Glazed nose and a navigator dome implies a bomber variant. No such was actually ever built, but since the photo is of a model that doesn't matter.
The only planned bomber variant of the Constellation was the B-30, but AFAIK it was supposed to get a new (wider) fuselage. The model (to me at least) appears to have the standard Connie fuselage.
This was the mockup / scale model of the proposed and unbuilt XB-30: