I have a 20 gauge that I am having a hard time determining the grade and worth. The gun has a patented of May 28,1901 the serial number is 5594e. The gun has an engraving of a quail standing on the left side and a smaller quail engraving on the right. L. C. Smith is printed on the bottom of each side. Please help me. I have exhausted all means of online research and have not found this gun.