I’d estimate a ~1927 build and ~1929-30 delivery based on comps in the archives. Somebody with a copy of Spann’s guide handy might be able to dial it...
I only disagree insofar as the Loar era also coincides with a number of advances — adjustable truss rod, more narrow neck profile, adjustable bridge,...
I have never added a strap button to a mandolin that lacked one (including a 1924 Gibson A snakehead) or removed a strap button from a mandolin that...