I recently purchased my 1st K98k with a receiver stamped 243 1938, serial #6900. I know where it was made based on the #243. No other matching numbers other than the one on the stock and the electro-penciling on the bolt and trigger guard. It also has a bayonet lug that appears to be made of a non-metallic material. It is my understanding that the bayonet lugs were not put on until 1939 or 1940. What I am looking for is a cleaning rod to fit it. I bought one of those after-market ones but it would not fit in the hole. I know it takes a short rod. My rifle is the bottom one in the picture.