The first Zeiss Ikon Ikoflex (the so-called coffee can model) allowed for the use of 120 or 620 film. It is fitted with two frame counters, depending on which film was loaded into the camera.

Some simpler 120 cameras didn't have posts for the fresh film spool, so it didn't matter what kind of film was loaded. I thought that I recalled seeing a camera with spring-loaded posts with a small central post for 620 and the thicker post for 120.