acm,
I have one of my mothers two sewing machines. The one I have is her HOTHER ( my avatar pic ), it is very close to your mothers MW. There might be some financial value to it as it's an excellent machine. But I couldn't care less about that as to me since it was my mothers it's priceless. Gather up all it's parts, oil it good, I recommend Tri-Flow oil, and use it. You'll be surprised at how good these old machines worked.
Joe