I recently picked up a 1925 Weymann Model 140 tenor banjo locally with the intention of stringing it like an octave mandolin and playing celtic tunes. I am not adjusting well to the scale length, so I'm considering selling it or trading it. It is in very good condition, but the resonator appears to be non-original because it is stamped Lyon and Healy and has a center attachment screw. Ebony fretboard, pearl inlays in headstock, 18 frets, OHSC. Any ideas on the value of this instrument?