I have one. It came to me rusty, with the handle broken, and missing saw nuts. It is a 10tpi crosscut. You can see the medallion after the grunge was removed.
I made a new curly maple handle, put new after market saw nuts on it, cleaned the grunge off and put Johnson's floor wax on it and sharpened the saw.
It has five saw nuts. When I sharpened the saw, I filed the old teeth off and re-toothed the saw. The medallion is visible and the saw has a bright look.
I filed it cross cut and it really cuts fast and smoothly.
I have 12 old handsaws and most of them have been sharpened and set. I have seven saw sets, may favorite is an old Taintor set.
There were saw nuts missing, so I had to put new saw nuts on it. I have extra Disston saw nuts, but when I use them, they may not
be the ones that were original to the saw. The D-12 is considered to be the top of the Disston line.