I have a banjo- ukelele, 4 string ,measures 20 1/2 inches, has a star mother of pearl inlay on head of fret bar, 16 frets, circle pearl fret inlay on, 5th fret, 1 inlay , 7 fret, 2 inlay , 10-1, 12-2, 15-1, open back, 16 pins hold skin on. There are no marking on anything. I'm trying to find out who the maker is and when it was made.