The base/rail is stamped assembler 36 on the bottom Georg. The same as the SSR assembler 36 scope mount pictured. Who, where, or when it was stamped assembly number 36 I don't know. Why I didn't picture it. The SSR scope tube obviously did not match when I bought it and the SSR scope mount on it was not rifle serial numbered to any rifle (pictured).Does the base have any numbers on it?