Charles,
One collector. Mr. Chuck Whittaker, has a nice web site with one section dedicated to Bulgarian luger and holsters. You can see the Bulgarian link at the top of his home page at :
http://www.landofborchardt.com
Also check out the "Holster" section also listed at the top of the Home page in the "Accessories" selection button. There is quite a write-up about Bulgarian (and other) holsters...
Looks like your type of holster was made both for the M1900 and the M1906 Bulgarian lugers...
Regards,
Pete... <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />