okay I have done some searching for you
The brand you listed Vanadium was a badge name for the National sewing machine company. What that means is that National made the machine and then put a store (or) company name on it
So if you search for belts bobbins and such under the national brand you should be able to find if you can find stuff for it
Hope that helps
Also there is a antique sewing machine forum that I go to, I dont know if I can put the address here but if you want it you can PM me