Yes
Kirby magic finger was created in 1946-1947. The 505 first produces in 1945 had a belt cap. I have one of these models. It could have been as early as late 1945. The 505 with black belt lifter in which first magic fingers was introduced. The 508 has a red belt lifter and in same Kirby calligraphy. If you notice the circle on the k of Kirby.
The 509 through 513, 514 or 515 the belt lifter calligraphy changed on 509 but it remained red through 513 etc. I'm guessing the magic fingers last appeared on dual sanitronic 80.
Les