transmission date code

Idle curiosity really but K0 , I assume no I but is it december 40, 50 or 60 and how do you tell? Thanks in advance

In the 40's they used letters for the month cast. In the 50's they used numbers for the month, i.e. 2 0 would be Febuary 1950. I'm not sure what they did in the 60's.

Cheers Ralph, that's a good result then getting a knuck case.