Animation historians can sleep a little easier tonight. We now know that the rotoscope model for Superman in the classic Fleischer Studios shorts was a gentleman by the name of Karol Krauser. According to the Superman Homepage, Krauser was “best known as one of the Kalmikoff Brothers, Mad Russians, in the wrestling world of the 1950s and 1960s.” More info and photos of Krauser can be found on the Superman Homepage.
Here’s an example of the Krauser-inspired Superman:
(Thanks, Brian McKernan)