This is a PLKV Mitglidsabzeichen, which was the official membership badge of the Preussischer Landeskriegerverband from 1918 to 1933. It was made by Heinrich Timm whose factory was in Berlin at Wallstr.21/22. Because of the hole in the top of the shield, I think this badge had a attachment that has come off. Looking at the pin the left band has Preussischer Landeskriegerverband printed on it. The right band has nothing, which is not unusual. All-in-all, given its age, it's in pretty good shape, though the pin is missing on the back. It's among the WWI stuff I'm getting ready to sell and I wonder if any of you can suggest what would be a reasonable price to ask?