- left side upper portion
- Left Side Upper Portion copy
- left side views
- left side with neck
- left thumb rest octave lever
- left thumb rest octave lever water key strap ring
- Low C & Eb Mechanisms
- Lower Portion Front View
- lower portion front view
- Lower Portion Left Side
- Lower Portion Rear View copy
- Lower Portion Right Side
- Lower Stack Keys
- Made Exclusively For H. Couf by Julius Keilwerth Musikinstrumentenfabrik