how to date my Zeiss

I received an older Jena semiapo that had been in a basement for twenty years. The owner said she belived it was from the 30's, but could'nt be sure. I am trying to find out how old it is, can anybody help me.


Jamey

Oh, you can try not bringing her flowers on your date but a Zeiss Jena Abbe ortho eyepiece instead ;-).

Ron B[ee]
PS - oops, so sorry - I didn't know you meant calendar date ;-).