Re: C.G. Conn alto sax that really needs some help in identifying it's info!
The serial number would put it at 1935, A is for alto and L is for low pitch
(a good thing!). A pro model horn and a very good one at that. I'm not sure if it's a bona fide 6M or a "transitional" model between the 6M and its predecessor. As to how much it's worth, that depends on condition- you might check around on e-bay or some vintage dealers to get an idea. I have one of these built in 1933 and find it to be a joy to play.