Zeiss Ica Icarette Mod. I, from the mid-20's, takes 620 film,
That camera must have been made for 117, since 620 wasn't introduced until around a decade later... Apparently some early examples of the Icarette 1 were made for 117, which (like 620) was the same film width as 120 but on a slightly smaller spool (6 frames of 6x6 on a roll, IIRC; 117 was discontinued after 120 added the 6x6 framing track). That spool might be similar enough to 620 for the later Kodak lock-in format spools to work in a 117 camera, but 120 is often pretty tight in 117 cameras (as it is in 620).
It must have been the 6x6 Icarette that took 117-film, because it had the markings for 6x6, which 120 didn't at the time.
I looked in the ICA catalog from 1922 and it indeed says for the Icarette I "Für Rollfilme 6x6 cm" and for the Icarette II it says "Für Rollfilme 6x9 cm"Yep, and that's why the first generation Rolleiflex had a frame counter instead of red window advance. Same for the Super Ikonta B 562/16m a 1938 design (American 120 had a 6x6 track by then, but apparently German film didn't, or didn't always).
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