The Walther PPK (Polizei Pistole Kriminal) was produced since 1930. It was developed for a hidden carriage. The engineers from Walther reduced the length, width and weight. The main difference to the PP is the frame with no back strap. this function was integrated in a single molded Grip. Also the grip was shortened, so the clip has only a capacity of 7 rounds. The shortness was balanced with a magazine-shoe on the bottom.
Any data on: PPK, s/n 145507, on left slide is 'Carl Walther Waffenfabrik Ulm/Do' followed by the new eagle over N (post war obviously). Second line 'Modall PPK Cal. S/n 145507 is on right si read more. Walther Ppk S Serial Numbers Lookup Fortunately, given the historical background of Walther pistols, there are books available that list many of the serial numbers of the guns that were produced by Walther. Please contact Walther Arms via phone (479) 242-8500 or email us using the Contact Us form if your PPK or PPK/S serial number is within the range of recalled guns. Our customer service team will provide you with an RA#, Return Form, and a PrePaid FedEx label. Important Safety Recall – OCTOBER 2012 Walther PK380 Pistols. I know Smith acquired Walther a little while back, but it was only when I really noticed the gun's serial number that it got me curious about it. The right side of the slide says 'Walther USA, LLC' and beneath that 'Springfield, MA'. The serial number is '9800AAA'. I have never seen a serial number end in 3 letters, let alone three of the same. Walther Ppk Serial Number Search Online assist I too, am now the owner of a Walther PP, and would like to do some research as to the firearm's dob/pob and any other information. It has CAI Vt as the importer, and a Stag horn with a 75 which I am taking to mean the barrel was proofed in 1975.
The PPK and the PP were also produced very successfully after war. Even James Bond had an Walther PPK.
Technical data:

Caliber: | 7.65 mm |
Function: | Blowback; hammer outside; slide catch, double-action |
Barrel length: | 84 mm |
Weight: | 580 g |
Magazine capacity: | 7 rounds |
Production datas (for Wehrmacht only):
Company: | Waffenfabrik Walther |
Location: | Zella-Mehlis (Thüringen) |
Period: | 1940 - 1945 |
Amount: | 26.000 |
Serial numbers: | 270100K - 424619K |

The Walther PPK for the Wehrmacht was split in 3 major variations, according to the army acceptance and finish.
1st Variation (Highpolish-Finish with Army Acceptance E/359; approx. 3.500 pieces)

Characteristics:
Interarms Ppk S Serial Numbers
Legend: | Walther-Banner Waffenfabrik Walther Zella Mehlis (Thür) Walther's Patent Cal 7,65 m/m Mod. PPK |
Finish: | high polished Finish, blued |
Grips: | one piece chequered Bakelit with Walther-banner, brown |
Serial number: | 6-digits number with suffix 'K' right on frame 3-digits scratched inside of slide |
Acceptance stamp: | E/359 left on frame E/359 left on slide |
Test proof stamp: | E/N right on chamber E/N right on slide below ejection port E/N on barrel near muzzle |