So it does make some sense that many of these were harvested over time.
Yep. Just imagine... These weapons where often already in dutch hands during the crisis in the 1930's. Useless gold laying around on your attic.
And they where around in WW 2. Food was scarce, sigarets and coffee where hard to get and than you find this piece of useless gold fixed to an old sword that was also not very usefull.