Bill and Dennis,
I'm not certain what the vintage on my sight is and I'm not certain how to date it. The screw head on the one screw I have looks like the one on the left in Dennis' picture. The people at Lyman told me what they thought the thread pitch to be but I suppose it could be 56 as they seem to have been going from memory.
If one of you gentlemen would be willing to sell me a screw I would be most appreciative. As uncommon as they are they're likely worth multiples of their weight in gold or platinum.
Jerry Liles
