| Maker | John George Klemm (1795-18??) and
Frederick August Klemm (1795-1876) |
| Dated/City | c.1820/ Philadelphia |
| Key/Pitch (MHz) | 5 keys Clarinet in Bb |
| Descriptions | Boxwood, Ivory ferrules, Original grenadilla wood mouthpiece, Five brass keys with flat, square key covers; springs attached to keys mounted in blocks. |
| Full Marking | ” KLEMM / PHILAD ” : upper joint |
| Additional Marking | ” Bb” : upper joint, middle joint, and lower joint |
| Length | 660 mm. / 590 mm. (without mouthpiece) |
| *Note: |
