Welcome to QB! I'm in Texas too! I'm in the Houston area. I have a couple Featherweights and I agree with checking out the Featherweight Shop. You can find a lot of info about your machine there. Values can fluctuate with the market and the condition of the machine. Scratches, rust, missing decals all detract from the value.
If you are in the Houston area and want to sell, send me a private message and I can check around with some of the quilters in my guild to see if any are interested.