I ran across my saw that is one of these in my till today. I had forgotten about it. If you read through the string, you will see where I made a new handle for mine.'
If anyone is interested, I will post a picture of it. My saw has a nib on it. It cuts straight and fast.
I looked at the Disston Institute and the saw is a D-7. It looks like the saw shown in the Institute the second saw down from the top of the D7 section.
I forgot that I had posted about this saw before. I made a test cut with it. It is a sweet cutting saw. It cuts straight and fast.