Wow Jeff, that is a really neat looking whatzit. Have no idea whaztit is tho. What part of N Ga are you in? My bro lives at the foot of Flintstone Mt/Rossville.
It was found on a 1940's era home site near Lawrenceville, GA. Don't think the number is a patent # as it looks too short. Would think it might be a PN for the item? Tried a Google search on the number but nothing.