Possibly already well-known to many of this forum interested in historic aspects of the vintage music trades, but was a pleasant discovery to moi..this periodical includes articles and ads about instruments, manufacturers, developments, artists, venues, profits, investments, detailed factory catalogues...etc.
Detailed and well written, the compendium "MUSIC TRADE" is a wealth of information, and may be of considerable use to those seeking information about their vintage instrument as it was published monthly and ran for a goodly number of years.
I am having difficulty sharing the links on my wife's tablet...but if you Google "MUSIC TRADE" you can find various links to digital online copies, and ebooks which you can view or download.
Wikipedia also has some links including some through Princeton University.
I spent a good bit of time enjoying the 1922 edition August and September postings.
Enjoy! Please add a direct link to a good ebook version if you can.