Found this in a low point on the Raritan River in Hillsborough, New Jersey. I believe it's some sort of fishing weight or loom weight but I can't find anything that looks identical. Please let me know !
Well if it is a casting net weight, it appears to have very little oxidation on it, leading me to believe it isn't extremely old. Tough to put an exact date on it, especially when they are still in use today.