[uncut]

Your PPK is in the right serial range for a "German" PPK
however it was made by Manhurin in France and shipped to Walther for marking and proofing of the PPK

.380 100305-266310A 06/1955-10/1985

The PPK and the PPK/S shared the serial range

 

[uncut]

chucker
the only PPK/S made in 1968 was the PPK/S in .380 .... but production did not start till June of 1968... and the serial rnage started for the PPK/S in .380 @ 134941 ... these also were made by Manhurin and then shipped to Ulm

 

[uncut]

1986 Interarm was licensed to manufacture the PPK.
first in .380 SS and these had the "A" prefix
form 1988 in blued and they had a "K" prefix
and the SS .32 had the "B" prefix

I do have no idea about the serial range on these Interarms guns... and I have yet to find anybody that knows anything about the serial ranges of them