I don't know if there is anyway to date the old pre-CBS Klusons.
I have a real deal 1953 P Bass and it's Klusons have 4 little tiny half moon sharped holes that are really hard to see on the bend around for the tuner shaft.
Two on top and two on the bottom. (The '53 also has straight blade screws for for holding the string tuner post in place.)
Then, I have a 1962 P Bass and it's Klusons do not have those tiny half moon holes.
Finally, I have a 1966 P Bass with the vintage Klusons and I noticed that the tuning gear teeth are ever so slightly inner rounded for each tooth whereas on the '62, the gear ends are nearly flat.
I can see that your Klusons do not have the 4 tiny half moon holes and I can't see the gear's teeth very well but all in all, your tuners favor my 1962 in appearance.
I will say that over the years, there are ever so slight differences with the old Kluson.
Maybe some other knowledgeable TBer can date old Klusons.