I am a newbie so please forgive. I am not sure where to post this. I have a Leblanc Alto Sax Model 100, Serial Number 549. It was my dad's. I have the original warranty card and sales receipt from 1963. I have the original case but really know nothing about saxophones so I was hoping someone could help me out in determining it's value. I have been holding onto this for so long, I am thinking instead of selling it to someone who has more appreciation for it. Any help is appreciated in figuring out what the value of it even is!! Thank you.