National Triolian. Serial number is 676w, meaning it was built in 1930 and was originally walnut burst.
At some point it was refinished and a Seymour Duncan pickup was added. It recently had a neck reset.
Cone and coverplate are replacements from National.
It plays and sounds great, currently set up with Martin retro lights, tuned to open g.
May be open to trades. $1800
https://reverb.com/item/80031779-national-triolian-1930