The Dopyera brothers started the OMI company making Dobro style guitars in 1967 under the 'Hound Dog' brand name. From 1927 to 1935, Natonal used a different serial number system for each model. This particular model is built with German Silver. A traditional three-way switch selects the pickups. Mark Knopfler's National Style O has the serial number B1844 according to the.
