This scope has picket post and cross hair recticule, not duplex and has 7/8 inch tube diameter, 2.5x (same as Lyman Alaskan). 1990 vintage I am sure would be 1 inch dia. tube.
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The trigger work seems pretty involved/expensive for something run up for possible civilian sales, or made by bubba. I note Skennerton's sketch of a unique trigger sketch set up by LB.
I expect the buttplate was an example of a cast steel design that was obtained before it could run down the line and have the butt trap holes added. I get the impression that most of this stuff was in an Engineer's drawer for show and tell in the office (guilty as sin there and glad I didn't have engine blocks at my desk!).