Technical description: Metal body with four bell openings and three valves. Valves activate metal reeds, giving the following notes:
0 = E♭;
2 = G;
1 = B♭
1 + 2 or 1 + 2 + 3 = high E♭;
3 or 1 + 3 or 2 + 3 = chord of all four notes.
Signature/Marks: Stamped on longest bell, "KARL BRUNNENBERG / KONIGSBERG i.Pl"; stamped on first valve casing, "33".