Label: Guitar Zither Menzenhauer’s No. 2 1/2 D, G, M, P & Menzenhauer No 63 664 Fabricht von Schmidt
The guitar fingerboard zithers Menzenhauer Friederich (1858-1937) was developed in the late 19th century who is German origin but living in the US from 1882. This types with underlying score sheet produced in Berlin, Kliegenthal and Markneukirchen.