Hello Charles,
From Eugene Bender's large book on luger hosters and accessories on page 73; this is a Bulgarian holster/rig for their M 1906 luger. It should have a pair of belt loops on the back.
Good luck on the auction... <img border="0" title="" alt="[Wink]" src="wink.gif" />
Regards,
Pete... <img border="0" alt="[typing]" title="" src="graemlins/yltype.gif" />