Stan:

In this case "farm condition" included significant blue wear at the carry points, some brown freckling on the receiver where rust was started then halted before pitting, butt with shallow scratches, dents and flaking finish, checkering well worn and where remaining full of grime (tractor grease and wheat chaff?).
On disassembly I would posit the internals had never been accessed or lubed since the factory. Basically it looked like it had killed a lot of everything with feathers on his humble farm since the 40's. And I found it still could even before I got home to pull it down.
I could see the homeplace in the distance, where he'd assembled about two dozen dull tractors, seeders, swathers, hoppers and a few combines that might still roll on the upwind side, as is the local practice when you've never had barn space for it all. He said his kids weren't interested in farming or hunting, especially during the dry years.

GG