That guitar was marketed as a National FT-440-2 in the early 70's and probably under a few other names. They were contracted and imported by the Strum and Drum Company. It is worth between $50 and $350 depending on the condition and how bad someone wants one. I had one. Mine had a changed bridge pickup because the original was dead. The body is often made of four 3/4" planks glued together and you can usually see the seam on the outside. Some of the necks are those Japan multi laminates like mine was but I have seen some with regular wood necks although not usually maple.