National Duolian Resophonic Guitar (1931), ser. #C-1551, brown hard shell case.

National  Duolian Resophonic Guitar (1931), ser. #C-1551, brown hard shell case.
National  Duolian Resophonic Guitar (1931), ser. #C-1551, brown hard shell case.National  Duolian Resophonic Guitar (1931), ser. #C-1551, brown hard shell case.National  Duolian Resophonic Guitar (1931), ser. #C-1551, brown hard shell case.National  Duolian Resophonic Guitar (1931), ser. #C-1551, brown hard shell case.National  Duolian Resophonic Guitar (1931), ser. #C-1551, brown hard shell case.National  Duolian Resophonic Guitar (1931), ser. #C-1551, brown hard shell case.National  Duolian Resophonic Guitar (1931), ser. #C-1551, brown hard shell case.National  Duolian Resophonic Guitar (1931), ser. #C-1551, brown hard shell case.National  Duolian Resophonic Guitar (1931), ser. #C-1551, brown hard shell case.