A DWM 1st Issue, even one in fine condition, is not particularly rare, nor is the 1910 dated holster it came in. What is rare is when they have matching unit marks.
I bought this rig a while ago, together with several other high condition Lugers, when the "infamous Dale Buller" was ordered to dispose of his collection of over 700 guns by a judge in California. I'm enclosing a link to one of the many newspaper articles that appeared at the time. They just don't make collectors like that anymore!
http://www.calaverasenterprise.com/n...e3f959292.html