Plymouth Mail , February 21, 1919 If you've never heard of a grave bomb you're not alone. I've seen many devices to thwart grave robberies but nothing like this. The picture depicts what the device strapped to James Havershaw's casket at South Lyon Cemetery looked like. He died of diphtheria in 1883 and his father was fearful of grave robbers and purchased the device. Upon his own death in 1919 the son was removed, presumably to place father and son side by side, and the bomb was discovered. it was put on display at H. L. Richardson's store in town.