Re: Martin saxaphone
It is most likely a Martin Handcraft from ther late 1920.
If it is an alto, valued around 500
If it is a tenor, valued around 750-900
If it is a C melody, 75 to 200
It will cost around 500 to get it playing decent. You would then be lucky to get the cost of the work done. I'd put it on Ebay starting around 100 bucks and go from there. They are very common.
If you want more specific info, you need to include some pictures.