This is a vintage Marxophone “fretless zither” made by Manufacturer’s Advertising Co. This particular example, serial number 0789, is in very nice original condition and includes the original guitar method and songbook paperwork. This example features: patent number 1044553, (4) sets of chords, and (2) octaves (C-C) of double melody strings. It is in excellent structural condition with no breaks, no cracks, and no repairs. The strings appear to be original, and all hammers are in perfect functional shape.