[QUOTE=6string;5902831]Hi Quack1 and M-Tecs,
Thank you, that is a wealth of information. Attached is another photo that shows a “W” under the base.
Looking at the other pictures, there do not appear to be any hash marks under the screw-in aperature.
Oh, the screw spacing on my 700 is 5/8”.
Here's a picture of the dual hash marks on my #80. There are no code letters on the back of the base. It was on the gun when I got it, so have no idea how old the sight is.
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