I just read that since the end of WWII German EOD has defused 7500 bombs in Berlin alone and guess that another 3000 are lying around somewhere in Berlin city. By the way a German pound is 500 gramm and 1000 gramm equals a kilo. so in Germany 500kg is 1000lbs. Germans actually list the bomb as a 10 Zentner (one Zentner is 50kg) bomb. Danny