"the cable hooks are on the wrong side for a convertable
Could be a Senior handle then, my 652A has the cable hooks on that side, although it has a spring-loaded doodad to hold up the bag rather than a long spring, I don't know about later senior handles being any different though... :\
Can't help but noticed one of the juniors in that collection (the U1104 like what I had) having a plug fitted that are notorious for being too weak and the user pulling the cap off when trying to unplug it from a tight socket... :S