This information from Paul Plier fron the Grand-Duchy of Luxembourg:
McIntyre System Clarinet was probably manufactured by Thibouville Frères.
Information of fingering from Ken Shaw at the woodwind.org clarinet forum:
Information from the U of A clarinet collection.
Also I copied these files from the UArk collection:
Serial #5213 “L1” batch mark.
Barrel: no original barrel or bell, using a 65.3mm plastic barrel for this test
Bore LH joint top: 14.6nn
Bore LH joint at bottom: 14.6mm
Intonation results taken when playing loud and not lipping. See how to interpret these results on the Model Comparison Page.
For this test, I pulled .9.. at the barrel and .3mm at the center tenon.
This clarinet currently resides in the collection of David Watson of California.
Intonation summary: The two throat tones marked are flat because of an as-yet unsolved problem in regulating the McIntyre special keys. Sorry! I am sure these two notes will play in tune with proper regulation. This is very solid intermediate intonation. This clarinet can be played in tune.
Key work quality: Very nice. I have found it very hard to get the mechanism to work properly. The adjustments for spring tension are tricky. In some cases one spring raises one key and must overpower another spring to lower another key.
This clarinet is most appropriate for: People who hate the normal fingerings for the throat tones and want to have something that does not require the left hand to move out of position. If you learn this clarinet, you will not want to switch back and forth to the regular Boehm system. I don't think you will find a McIntyre A clarinet. For this reason, people who play in orchestral settings will not want to consider a McIntyre system clarinet.
Condition issues noted: None.