The 65mm Angulon is not a 100% indicator of format. If you had a link to the photos of the camera, somebody could probably tell you if it's a 4x5, 3-1/4x4-1/4, or 2-1/4x 3-1/4. Sometimes you can tell by the location of the body release: a baby Crown has that at the bottom corner and a 4x5 has it somewhat higher.