Welcome Bezzer,
I do not "restore" sewing machines, more like I refurbish them. I like to tinker with them and try and figure out what makes them tick.
My favorite ancient machine right now is a Minnesota Mdl ~B~ I got from a forum member. Kinda ugly/cute, sews slow with it's add on friction drive motor and that great giant hand wheel. My wife says it sews way to slow for her.
Joe