I have a keen interest in the Second World War and got to thinking about the Battle of Britain and the dogfights that took place over Southeast England. Thinking about all the shooting that was going on the next step is to wonder about the thousands and thousands of brass bullet cases which would have been falling from the sky. I suppose there must still be some lying about. If anybody has one of these with the markings on the bottom I will gladly swop a used No 36 Mills Grenade base plug !!