I have a 521/16. It has the Opton Tessar lens and a Compur Rapid shutter. I emailed Zeiss and they said the lens was made in 1938. First question is that seems kinda early for this model. Second question is on some types of film the roll is loosely wound when I take it out. I have Other folders and this isn't an issue. The camera is in great condition. Thank you for any input.
Opton Tessar was made in West Germany, i.e. after WW2. If the lens is coated, it's almost definitely post WW2. I don't think the people your emailed know what they're talking about. The 521/16 was made 1948-1953. It has to be a post war camera. Would have helped if you gave us the lens serial, and a photo of it.
if the rolled film on the take-up spool is loose, you can add some resistance to the system by sticking a little bit of sponge in the supply side, just thick enough so that it rubs against the roll as it unwinds. This will make the take-up side a bit harder, but makes the film wind tighter.
No, it's pre-war. 1938. Carl Zeiss Jena cannot be Zeiss-Opton, which was in Oberkochen and not in Jena.
West German Zeiss restarted the serial numbers after the war, and the lenses were marked Zeiss-Opton for a while, and then Carl Zeiss. The serial number 2314093 would have been used in 1955-57 or thereabouts, when the lenses were marked Carl Zeiss. Never with Jena.
The camera was made in 1938. The lens serial number is from that year (all pre-1945 Carl Zeiss lenses were marked Jena as well as post -1945 East German Carl Zeiss lenses) - see here for a time sequence of Carl Zeiss serial numbers.
The body number - G 46151 - is also from 1938 although Zeiss Ikon restarted the alphabet once they reached Z but other G body numbers would have been very early 1920s (too early for an Ikonta) or the 1960s (too late for an Ikonta).
The Compur shutter serial number will confirm the date - here for a time sequence of Compur serial numbers.
The original post and subsequent post contradict each other, because the lens cannot be marked "Carl Zeiss Jena" and "Zeiss-Opton" at the same time. It's either one or the other.
Also, you will never see "Carl Zeiss" on the body or "Zeiss Ikon" on the lens (although you do see it on filters and supplementary lenses). Carl Zeiss and Zeiss Ikon operated as separate entities.
Yes, Mike, Carl Zeiss made the lenses and Zeiss Ikon the cameras - with the exception of the Werra made by Carl Zeiss Jena on the banks of the river of the same name.