Derek Seltzer very kindly asked some people about the S XIX marking and James Cate came back with the suggestion that this may be an unofficial mark relating to a ship. I'd love it to be a sub but I think that would be a U marking and not an S. In any event, given the efforts of my Dad and others in the Royal Navy, it is highly unlikely that a U Boat issued 1939 Luger would not be at the bottom of the Atlantic. I'm inclined to believe that it is a ship marking and my inclination is that, if so, it may refer to a Schnellboot or S Boat as these operated extensively in the North See.
Another suggestion from Bob Burden was that it could be an SD Police marking as districts in Dusseldorf were numbered Roman style.
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