4000lbs or as they said on the news lately about the one found in the Rhine in Koblenz, Germany, 1,8 tonnes. Notice the bomb disposal fellow with his Irish setter dog near at hand about to defuse it manually, unlike the one in Koblenz where they used a controlled explosion.
Other photo's on my web site show that he was going to use the biggest lump hammer in the world in the task, probably kept one finger in one ear just incase!!

Yes, members of our family may have been friends in the past but unfortunately for Bomber Command, friendships never lasted long in many cases.