Bob, I don't have any record of a patent for this sundial - but F.H. Hagner was granted patent 2,460,346 (Feb 1, 1949) for a Star Matcher and Sun Compass. At first look, it appears that it might be an early version of the dial you are looking at. Full copies of the patent with figures can be obtained from the Patent Office - I think the fee is now $3.00
Fred
