| Maker | LEFÊVRE / André Thibouville (1886-1899) |
| Dated/City | c.1890 / Paris |
| Key/Pitch (MHz) | 13 keys Bass Clarinet Clarinet in A |
| Descriptions | Boxwood, Ivory ferrules, Original stamped grenadilla wood mouthpiece, Six brass keys with cup key covers; springs attached to keys mounted on pillars. |
| Full Marking | ” (five pointed star) / LEFÊVRE / A PARIS / (five pointed star) / BREVETÈS / FL (monogram )” : upper joint |
| Additional Marking | ” (five pointed starts) / LEFÊVRE / A PARIS / (five pointed star)” ” : barrel, lower joint, bell |
| Length | 630 mm. (without mouthpiece) |
| Note: | * earliest Bb mechanism on clarinet |
