US made parlor sized guitar that has been converted to mandocello. Jackson Guldan guitars had a unique neck setup - the angle can be adjusted by turning a screw inside the body - at the neckjoint. -- With that adjustable neck, a 24'" scale, and a trapeze tailpiece it makes it a good choice for octave mandolin, double tenor, or in this case, mandocello conversion.
I've put on new Grover type tuners and installed an adjustable single coil pickup with volume and tone controls. -- Tuned to standard CGDA. The string height at the 12th fret is set at 1/8" bass side and just under that treble side, and it plays easy there up and down the fingerboard with no buzz or flat notes. Acoustically it has big projection with a lot of natural reverb - plugged in it has a kind of dirty P90 sound - plenty of bass.