HI all. I have had this old guitar for a while now. I finally did a neck reset on it last week and made a new bridge. I have wondered for a while who the maker might be and hope someone here might have an idea. The only markings inside is a stamp that reads 'made in USA'. At some point someone scratched some numbers on the back of the peghead, but I I do not think they are from the builder. The original pickguard was very small and awkward looking, it was held on with screws, I replaced it with the one shown in the picture. Thanks for your time.