Thank you for the info.... I meant to share with you that the first saxophon you were telling me about (the silver soprano) a gentleman told me some more info that he thought about it...  do you agree with him?

 

  Actually this is a stencil of the Pan American model 58M, vintage circa 1929.

The Common-Wealth brand was brand Trademarked by Maxwell Meyers of Boston and launched in 1927.

The interesting part of this Soprano is the stamping of the Dec 8 1914 stamp indicating the Haynes Tone-Hole license. By this time Pan American was using the Hardy Sep 14, 1915 tone hole stamp.

It is not Conn in the way the term implies:
Pan American was a relatively independent manufacturing subsidiary of CG Conn Ltd, incorporated in Jul 1919, with its own separate factory opening in Nov 1919. All stencils came from the Pan American factory and its models.

CG Conn Ltd was brand, manufacturer and holding company like General Motors with GM, Cadillac, Buick, Chevrolet, etc subsidiaries. Pan American was one of Conn's. Conn Ltd the manufacturer was another subsidiary.    

No I do not agree whatsoever.

The patent information on the instrument is strictly conn, not Pan American, which conn absorbed in later years.

The patent information is put on an instrument in order to be very specific.

In any event, it is a vintage soprano nearly 100 years old.

The specifics are quite redundant.

 

Good Luck