I've gotten my hands on an arrangement by Simeon Bellison for clarinet quartet * of a Suite No. 2 / W.A. Mozart. This surprised me because Mozart didn't complete any suites as far as I know. I checked the Köchel catalogue on wikipedia and the IMSLP catalog and there's nothing of this sort.
I could find only scarce mentions of it on the internet:
- Amazon lists the publisher as G. Ricordi & Co (1954).
- OCLC WorldCat confirms the publisher and adds a few more details.
Since the arrangement is from 1954 I can afford myself to think that musicologists as the time didn't correctly identify the piece. It also came to my mind that Bellison took various movements from other pieces and compiled them into a suite himself.
Note that the name of the piece hints that a Suite No. 1 existed. I could only find a mention of such a thing on Amazon and it's for clarinet solo and piano published in 1941. So, the publishing date checks out as being before Suite No. 2 and again it's possible that Bellison mashed up parts of other pieces into a suite.
The Suite No. 2 has 4 movements (pictures show snippets of the 1st clarinet part):
*The parts are clarinet 1, 2, an Eb alto clarinet or a basset horn in F, and a Bass Clarinet. A 3rd Bb clarinet part can substitute for the alto/basset part, in which case alternative parts are provided to account for this difference.