The upper and lower parts of one horn do not match — and the collector labelled it so.
The seam between the sections runs at an angle, and the profile above and below it differs. It is an assembly of two horns, made at some point for repair.
The sound through it is uneven: the middle is duller than it should be. Koval left the horn as it is and said so on the label — explaining that such a repair was ordinary practice when a new horn could not be had.
