"Ah, to build a better mouse trap…spring loaded hooks and lures have been around since the dawn of American fishing (seven of the first ten fishing tackle patents issued in this country were for spring loaded hooks). The object, of course, is to make sure you hook every fish that hits your lure. You have a simple yet effective lure called the Borgen Weedless Casting Spoon, patented on 20 April 1954 by Leif I. Borgen of Chicago, Ill. It came in several configurations; yours is the earlier one resembling closest the patent images. It's a cool and interesting lure worth around $20-$30 in today's market. To see the patent for this lure, click here."