Welcome, Floyd1.
Very nice looking machine.
It is great that it was your grandmothers.
I was hoping jlhmnj would see this thread. He knows his needles and which machines they go to. I'm thinking it takes what is known as Singer system needle 20x1. They are not readily available at the local sewing machine shop. Several have been known to take the modern system needle 15x1 or 130/705 H system needles and drop them a bit to match where the eye of the 20x1 would be. Another way to do it is put a piece of thin magnet so the needle only goes in the right depth. There are a couple of threads about how to do it at
http://www.victoriansweatshop.com/po...eedles-8224067 and
http://www.victoriansweatshop.com/po...eedles-8065031
Have fun with your grandmother's machine. I didn't think I would like treadling as had tried it once a long time ago. I have a few now and while I really haven't made a quilt or garment with them, they sure are fun to sew with.
Janey - Neat people never make the exciting discoveries I do.