Disston No. 80. This is a pretty uncommon saw to find. I think it's actually quite useful. When a backsaw is needed but depth of cut is an issue this saw will do the trick. It's kind of like the American version of a double-sided Japanese pull saw. The blade is thick compared to a Japanese saw since it cuts on the push stroke and needs to be strong to stay straight without a back.
This saw didn't need sharpening. I did some test cuts and it cuts well. One side of the blade is 15 ppi, crosscut. The other seems to have a hybrid tooth geometry and is 10 ppi. The etch is in good shape.
