If you can take more pictures, a close-up of the right rear dropout and the seat cluster; and these details will also help:

What is the diameter of the seatpost hole.
What's the distance between the two headbadge holes
What's the width of the BB shell, and are there any markings of the cups - knurled edges, rings or lines on the face, perhaps even text.
Is there a gear-cable stop on the non-drive side of the down tube.