Hi Vlad,
I think youv'e raised a very significant point, and it's something that I for one have never thought about before.
It would be interesting to see if any of us have a 1c with a serial number close to either your 1c, or your Fed-1S.
You have already shown from your own two cameras that standard Fed production was in place within nine cameras from your Fed-1S. It would be great if we could find another camera close to yours, but on the other side to narrow it down even further.
Quite a lot of us have already entered our Fed-1S cameras into the Wiki and so it should be easy for us to check if we have any other Fed-1 cameras (1c, 1d, or 1e) which come close.
Up until now I had only thought about comparing Fed-1S with Fed-1S, and not about comparing the relationship of the Fed-1S with standard Fed-1 production, which in fact will probably provide more detailed information and help to answer your question of batch sizes for the 1S.
I will be home in less than two weeks and will certainly check this out with my own collection along with some other checks regarding other questions raised by members, such as hole in the pressure plate, etc.
Whilst on the subject I have quite a lot of other data to enter into the Wiki when I am home, such as my Kiev 35mm rangefinders and other cameras. After all I wouldn't want people to think that I am too biased towards the Fed-1 would I!



Best regards, Jim
