Re: value of sax
I'm almost certain that that's one of the Adolphe Sax model horns produced after Selmer bought the Adolphe Sax Company in 1928, because of the low serial number (earlier horns produced by Adolphe Sax had higher serial numbers), and the "No." preceding the serial number, which was the style associated with Selmer-Sax horns. Contact the Selmer (Paris) company to see if they can trace its production date.
Adolphe Sax horns are of historical interest because of the direct line of the company to the inventor of the Saxophone, and yours looks like a beautiful example. Am I mistaken, or is it gold plated?