I notice in an earlier thread that someone was talking about 12" discs. I have a copy of 30001-L which is, I believe the first of the 12 Long play Diamond Discs. I am curious as to why the label states 24 minutes just as on the 10" Long Play. The actual playing time is nearer 40mins and that is how the records are commonly defined. Was Edison just cutting down on typeset costs?
Your 12" LP of the Hotel Commodore Ensemble is indeed a 40M record and sounds like an error was made in the printing of the label. Depending on the Letter with the matrix number 12012, it was recorded between Aug & Nov, 1926.