Maker Franz Carl Kruspe (1808-1885)
Dated/City ca.1870s , Erfurt
Key/Pitch (MHz) * Baermann-Ottensteiner (Mühlfeld) System Clarinet in C  (A=440 MHz)
Descriptions Grenadilla, Ivory ferrules, Original grenadilla wood mouthpiece, Baermann-Ottensteiner (Mühlfeld), *German Silver key cups; springs attached to keys mounted in pillars.
Full Marking ” (monogram on wings of butterfly) / C. KRUSPE / ERFURT / C “ : upper joint, lower joint, and bell
Additional Marking
  • ” (6-spoked wheel) / KRUSPE / ERFURT / C “ : barrel
  • ” C “ : mouthpiece
Length  560 mm. / 495 mm. (without mouthpiece)
*Note:
  • thumb f#/c# key
  • German Silver tube lined in the bore of the upper joint, German Silver socket in the barrel