I have a montgomery wards sewing machine electric in a wooden case. The top opens in 2 pieces one to either side & the machine pulls up. It also has 2 small doors on the front. I think this is the model number m 84 ns-4498a. I'm wondering how old it is and how much it may be worth. The machine works it just needs some tension work done on the bobbin. The wood may need refinished. I would appreciate any info I could get. I think it may be from the 30's or 40's. Thanks!