I suppose it depends on the serial number. This one is pre-74 in that it has no prefix. Leopold started adding a prefix, IIRC, in 1974. Moreover, the scope in most places has turned a plum color.
I had written Leopold to see if they could tell me but only got referred to their website under FAQ's. Since after looking through all that all I saw was those scopes made from '74 on so, I guess I can only speculate since this one has no prefix.