Re: Help me appraise my C.G. Conn Alto
What you have is a 1930 Conn New Wonder Series II or early transitional model Alto sax. The Patd date is for the Haynes drawn tone hole manufacturing process, and not the date of the actual horn's "birth" so to speak. The "A" is a catalog code for "Alto" and the "L" for "Low Pitch", i.e. 440.
These are desirable, pro vintage horns. Value will depend on the condition, finish etc. but you can expect AT LEAST a grand and up.