Confused about Disston no 7

[Mark Baldwin III]

Larry-If the thread size on the middle one is correct (approx .16") then that is probably what was on my saw. If I read the timeline right at DI, the medallion on the left of your picture is from 1865-1871...do I have that right?
Daryl-The left most nut and screw look correct to me. I didn't realize they were sand cast. That would explain the texture.
Thanks guys, you're a huge help!

[george wilson]

The 18th.C. saw screws were sand cast also. I made patterns and had ours cast,too. They are really rough where you can't see them,but that is how they were made.