I have a Kalamazoo acoustic that has been in my family since the 1940s or 1950s. Can you identify it and give me a estimate to its value. The neck might need some work because the action could be a little lower. It is also a little smaller than a usual guitar. Inside at the base of the neck the number is 513 I believe but it is hard to read. There are a few very small cracks in the back. My dad almost threw this guitar away back in the 1980's when I was in college. Thanks very much!