Originally Posted by
TX50
That is a British No.5 Mills bomb. It appears to have the base plate screwed on, in which case it's almost certainly live (ie. fuse, striker and detonator all fitted and ready to go)
Hell, shells from the Civil War have been known to go off when found on Civil War Battlefields. The NPS actually post signs warning people not to handle them if they find them.
The point is no matter how old it is,how rusty it is, DO NOT HANDLE AND EXPLOSIVE ORNDANCE.