Tom A,
This is a remarkable coincidence but last Sunday, the 29th September I purchased the exact same model gun at an auction here in Auckland , New Zealand.
First issue altered model Navy as below
The gun was complete with its Danish made Holster which has the Royal Danish Crown stamps inside the flap.
The gun is serial number 470 with no sufix.
It is all matching numbers including the Mag which has concentric rings and large numbers along with the Crown over M.
The gun retains about 95% original blue and most of the lesser parts retain much of thier original straw.
It has the word GESICHERT in capitals and has the slot milled under the safety lever.
It is unit Marked W.K. 94 just below the grip safty.
Apparently, this gun was reissued during the occupation of Denmark and used by the Danish Wharf police. The holster was made in Denmark.
It was one of twelve similar lots found in a Copenhagen bank safe after the war.
The gun is very much in the exact same condition as the one Tom A has described.
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I also bought a 1916 Naval luger with it's correct land forces holster, as issued to the Naval land forces late in the war, fighting in Belgium. It is the same as the rig shown in Jan's book on Imperial Lugers plate xxxii
I trust you might be interested
Kind regards
Murray.