Lead? Ive heard of copper, tin or bronze or even steel but never lead. It started when the French were there as a snub to the English... it didnt stick for either of them once the United States formed.

It died out cause we got more sophisticated ways to measure property lines and how to grant them.

I dont know of any legal precedent for the old European style or claims that go that far back but marking land with metal was common and still pops up occasionally to this day due to land inheritences and whatnot.

You might even hear stories on other reddits avout neighbors stepping on each others toes due to ignorance or maliciousness about where property lines are. Its the primary reason we have Tree Law.