The Corkscrew is a later model of the catalog corkscrew design, (1979) because if you look at the 'screwelements, you will see that they use a single support on each side as opposed to Arrows suspended and over-the-loop decorative support structure seen on CP's corkscrew (screws and loop) , SFGA's Demon (screws only), and Double Loop's vertical loops, and countless other Arrows made from 1975 to 1978