My bike is not that heavy, weighing in at 43lb 2oz, but I was reading in an edition of MBA a few years ago that there was a bike (can't remember who it was made by) that was given the nick name "chester" that weighed 63 pounds if memory serves.
I don't know if that means you don't believe its true or that you are just amazed. Just reading the comments on the picture you will see. Soild iron swing arm.