Perhaps Holst is referring to the Walther Olympia clone manufactured by the Chinese, known as the "Norinco TT Olympia" shown below:The Olympia clone is throwing me. Prezackly what pistol do you have? 1917
I believe that the barrel is pressed into the barrel boss of the frame just like on the PP and PPK.I have searched the web but am still unsure how the barrel is fixed to the frame?