Re: Need Info on C. G. Conn Alto Sax
try doing a carbon rubbing on the back above the thumb support. (about mid body) there should be some stampings. Do the same on the bell. Just take a piece of white printer paper and lay it on the part then take a pencil or charcoal stick and lightly rub the paper.
That may help you read those numbers. If it is a conn may be a New wonder or New wonder 2. Does it have a microtuner on the neck?