Both Dutch and German swords have a very similar guard and grip shape from what I could find, however that tab in the middle of the grip is very much a feature of German ones, not found on the pics of Dutch swords I could find.
However, that shield-shaped tab that slips over the outside of the scabbard would not be round-bottomed on a German Army sword, more of a five-sided home-plate shaped piece bearing a Reich eagle and swastika of typical Nazi form (
Reichsadler), with the downard point of the swastika filling the point of the shield; the eagle and swastika look to be cast onto the metal of the guard at time of making for an Army sword, and they appear to have painted or lacquered scabbards.
There is a very similar, simpler type of German sword which was for the mining organization (And there were commercial German interests and consultants in China pre-war), and swords of the German mining organization have the same round-bottomed shape on that tab as the one you have. The scabbard for them even appears to be bare metal instead of black lacquer (Or enamel?) found on the Army swords. As far as I can see the main difference from yours and a miner's professional sword is that there would be crossed hammers on that shield for a miners sword - however those appear to be added details, not cast in like the
Reichsadler on an Army sword, and it's possible they got knocked off at some point.
All in all a German miner's sword from the Pacific is still about as unlikely as a German Army NCO sword. They did lose their colony at Tsingtao and other Far East holdings to Japan's highly-opportunistic entry into WWI, so probably got a certain amount of gear like this to warehouse then, but I don't know how closely Imperial German swords matched up on the form with Third Reich ones...the Nazis were kind of uneven on whether they incorporated traditional ceremonial gear or came up with something completely Nazi.
Recommend you check this site out for some pics and info:
http://germanswordbuyer.com