Quote Originally Posted by brucemuir View Post
I believe it. From what I gather they are all good unless they've been abused

I could be wrong but your lens in those photos is marked Opton T which makes it post war from Oberkochen.
I think they changed serial # series when they moven to west germany...perhaps that's why you are dating that example to 1936?
Pretty much thats the official story the restart the numering but honestly, those times are a grey shaded area.
I happen to have Zeiss-Opton Nr. 26***, non coated, on camera made 1938.
Also, some of the post war Opton have issues with the canadian balsam.
Years ago, I was cleaning a Super Ikonta Opton (Tesar) lens for a friend, one cemented group had a tinny bits of fungus on the side.
Around that post WWII time, Leica had similar issues with, again, canadian balsam, M2, M3 prisms, Summicrons an we can go on up until late 50's.