I have a 6 string Regal guitar that I beleive is from the 1930’s. It has been in the family since before I was born. It has a short, 12 fret neck, spruce top and oak sides and neck. It is in perfect shape and has beautiful mellow tone. I play it every day. The emblem says: "Regal, made in chicago" Any ideas what its worth or where it came from?