I have played saxophone for a number of years. I currently play an SC901 Yanigisawa Soprano! However, I know absolutely nothing about Martin Alto's. A friend of mine has what I would call "a very pretty" Martin alto. The neck is not original, but the horn is in very nice condition. I believe it has been re lacquered. The pads are nice but probably needs a complete overhaul. The serial number is 56625. That is all that I know! He would like to sell it and I do not know how to direct him. Any input from anyone!