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This could vary widely depending on where -- and by what method -- the accordion is being sold (by an individual on Craigslist or e Bay, at a pawn shop or antique store, by a reputable accordion shop, and also by geographic region; the same instrument might fetch a higher price in New York City than it would in rural Arkansas).
For example, the record shows that all of the recorded Adolphe Sax instrument sales between 1940-1941 were from instruments already manufactued between 1931-36.
There is a fairly detailed record of these instruments recorded in a log book in the Selmer archives in Paris up to 1936 through serial number ~1364. Instruments manufactured after 1936 range in serial number from ~1350-3600. By comparing early verses later instruments, it becomes clear that some Adolphe Sax Selmer saxophones were assembled from the old Adolphe Sax tooling and other were put togther using parts and tooling from the Selmer St.
Despite purchasing all of the assets of the Adolphe Sax Company in 1928, Selmer did not start selling saxophones bearing the Adolphe Sax name until 1931.
The last Adolphe Sax saxophone recorded in the Selmer Paris archives was sold in 1944.
We always suggest taking a look on e Bay (at current and "sold" listings) to see what a similar instrument is going for - and you will likely encounter a very wide price range.