About National Guitars. Hi, here is a very early Duolian 12 fret steel bodied round neck guitar. This is serial # C110, meaning its the 110th Duolian produced. National Museum of American. I can find on it is a serial number stamped into the resonator cover. The numbers on the end of the peg head of my Dobro guitar. Audiolivro Noite Na Taverna Download. '

National resonator instruments introduced in 1927 were louder than conventional acoustic guitars of the era and where the first result of the research to amplify the sound of the guitar. They were very popular with Hawaiian and Blues musicians in the late 1920's and early 1930’s. The resonator guitar was fundamental to the evolution of bluegrass music.