No year stamped on Luger

[kmcd]

I just found this forum and have been tyring to learn more about my Luger. I found the pinned thread about identifying, with pictures, very informative and have learned a lot about Lugers in general from that and many members' posts. However, I haven't found how to determine the year it was made if no year is stamped on it. The serial # is 6571 with a script letter that I believe is a "t". There is also no country of origin on it.

Thank you for your help!