Hi Chris,
Welcome to the forum. Your Luger is a standard army issue. If there are no unit marks on the grip strap, there is no way to determine where it was issued. The eagle stamp on the breechblock is a firing proof. There should be one on the barrel and right side of the receiver also.
This video will help with reassembly...
http://www.youtube.com/watch?v=WBP0RX7mctQ