Herb,
The closure strap and it's configuration are not what I'd expect to see on a Dutch holster. Normally a brass plate is present, with a slit through which a brass lip is sticking out. The strap is fed through this brass lip. This holster has a closure strap similar to a German Police holster.
When the Dutch crown was used on military items, it was always a combination of the crown and a letter underneath, where the letter would depict the then king/queen. In the KNIL days it would have been a crown/W for queen Wilhelmina. Followed after 1948 by a crown/J for queen Juliana.
For 345 bucks it's a nice holster, though.
Land of Borchardt shows a Dutch holster in the normal configuration:
http://www.landofborchardt.com/image...ers/dutch1.jpg