Murray,
Here is some of the history of these GNR's and a M1914 Navy (1917-dated) from the same seller in NZ :
http://luger.gunboards.com/topic.asp?TOPIC_ID=4663
http://luger.gunboards.com/topic.asp?TOPIC_ID=4830
BTW...I have a scanned copy of the sales receipt for these 3 guns (plus one other...a M1900 AE) when they originally left AZ State in 1998 and headed to the NZ broker.