Chuck,
I will attempt to answer some of your questions but I think it is important to distinguish between proof marks and acceptance marks. Proof marks indicate the weapon has passed a firing test. Acceptance marks on parts indicate the part or assembly has passed government inspection for dimensions, hardness, finish, etc. Someone may correct me on this but I believe the only proof marks on your gun are (1) the Imperial eagle at the right end of the markings on the right side of the receiver and (2) the PTV/E on the barrel. The rest of the stamps are either Imperial acceptances (right side receiver) or Simson acceptances.
Simson was established by the Inter-Allied Military Control Commission in the early 20s as the sole facility for major reworks and repairs of military and police Lugers. Weapons were sent to them by the military and police authorities. If your TK is authentic and if Simson reworked it, it was probably sent to them by the police that had absorbed a Freikorps unit along with its weapons.
The Berlin armory was established in late 1927 and probably began reworking Lugers in 1928. By that time the Control Commission had been disbanded and things loosened up. The armory used components purchased from Simson as well as others. A variety of acceptance stamps are found on replacement barrels. I don't think there was a fixed "rework" plan for every pistol. It probably depended on what each needed. In many cases, it may have simply been a barrel replacement. However, that being a major repair, the gun would have been proof fired by the PTV.
Neither Simson nor the Berlin armory would have applied the TK stamp.
The E/6 and PTV/E stamps on the barrel are quite consistent with rebarraling by the PTV. However, the E/6s on the left side of the receiver and left frame are puzzling. The only reasonable explanation I can conjure up is that the gun was reworked by Simpson and then sent to the PTV for proof testing sometime between 1928 and 1935. The barrel may have been installed by either Simson or the PTV. This is pure conjecture, however.
I hope you enjoy the book.
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