Hi Jerry,
The picture appeared in 'The Dutch Luger' by Martens & De Vries. We agree that Dutch lanyards used on Lugers fell into two distinctive categories, same goes for the holsters.
On one hand, there are the KNIL versions, quite particular in design.
On the other hand, there are the Dutch Navy versions, quite similar to standard German equipment, although the first batch of Dutch Navy holsters were put together in a very, very shabby way. Several photographs of Dutch Navy staff wearing these typical lanyards exist.
Very undeniably, the specimens I own were made in the UK. Don't think Germans would stamp 'Made in England' on them...
I'll mail you the photo material I have.