DescriptionGibson Mandolin Family, National Music Museum, Vermillion, South Dakota.jpg
front]: 1914 F-4 mandolin, 1924 K-4 mando-cello, 1917 H-4 mandola, 1916 J mando-bass, 1904 A-4 mandolin, 1914 K-2 mando-cello; all by Gibson Mandolin-Guitar Co., Kalamazoo.
[right]: unknown mandolin, 1908 Kite mandolin by F. Lang.
[rear]: 1917 Symphony Style 5 harp guitar by Cal & August Larson, 1930 Aero-uke ukulele by Stromberg-Voisinet.
The Harp Guitar has a second sound hole - don't know that it qualifies as a side port...1917 National Music Museum in Vermillion, SD (home of a Stradivarius mandolin and guitar!)
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Gibson Mandolin Family & others, National Music Museum, Vermillion, South Dakota