Chagy's 'mystery find' reminds me of a funny story. Back in 1992 I found a similar object on the Green Cabin Wreck (1618 San Martin) that archaeologist Heather Gibbs (working for Mel at that time), identified as a sounding weight. It was heavy, about 12" long, conical and had a hole at one slightly tapered end. I thought it was a pretty neat artifact and had it for years, using it in displays and seminars. Years later I found out it was just a fairly modern window sash that someone had used as a weight for a marker buoy. It was iron, not lead. (what Darren was attempting to describe)
:P
-Tom-