My 1953/4 CZJ 150mm f4.5 T Tessar has the T marking but that was made at the point the separate East and West German parts of Zeiss had been forced to cease co-operation and legal wrangling over the trade names and trade marks started.

CZJ enses sold in Europe could have markings that were not allowed in the US, this is an Exacta lens and all Exactas sold in the US has to state they were made in the Soviet Zone, I can't remember the exact wordint but I have an Exacta WLF that "USSR Occupied"

E Von Hoegh's anecdote is probably right as it coincides with these US markings.

Ian