Ad: This forum contains affiliate links to products on Amazon and eBay. More information in Terms and rules
Looks like it has a "T" tail to me and something under the wings near the tips
Could it be a Sauders-Roe Princess?
This is the best I could find. It's just that the grainy photo shows the stabilizers as quite flat and the Princess has dihedral...
Is it possible that the film photo isn't even a real aircraft?