According to the seller, this blow accordion was made in 1936 by P.D. Deposee, in France. Apparently it weighs in at approximately 3 lbs, and measures 17″ in length, with a 3 ¼” bell.
Unfortunately this Deposee sax is missing its mouthpiece, but the seller does show how it comes apart, and describes the free reed mechanism of the instrument like this:
It has a reedblock inside of the body… and you can play multiple notes at once depending on how many keys you hold down!
Because it is a free reed instrument, it is more like an harmonica than a saxophone, since the sound is produced as the air flows past a reed that vibrates while it is held in a frame. However, like a woodwind, it has keys and tone holes. Unfortunately one of its keys is broken.
This particular example of a blow accordion has a total of 13 tone holes. Five of them are open, and 8 are closed, and operated with a key.
A couple of years previously I had seen my first Deposee blow accordion. Its metal body showed some signs of serious use and abuse over the years. There were some dents in the body tube, and a couple of the keys were broken off.