Can anyone ID this magazine?

[Mike B]

Greetings all,
After a year of more of wishing and saving I finally found a Stoeger. It is in near mint conditon, with the three line inscription. The magazine however, although probably not correct for this era, is very interesting. It is an aluminum bottom mag with the word "GERMANY" stamped on it. It is stamped in much the same way a commercial wood bottom would have the word "GERMANY" stamped on it. There are absolutely no other marking or proof marks on the mag. Has anyone seen one like this or know what variation of Luger this magazine might have originally installed in? The condition of the mag does not match the condition of the Luger. The mag appears to have its share of scrapes and scratches, whereas the Luger is nearly new. Any input is welcome.
Thanks, Mike