HCW you need to move to tidewater Maryland or Virginia to get them. Most of the early spots in Mass and the northeast are under concrete. Not so much here.
Calabash, there is a reasonable possibility you can find Roman coins if you find out where the fill from the WWII victory ships was dumped near the harbors.
That's an amazing find ! Glad I got to be there for it. Definitely Banner worthy !!! Not many people can say they dug a 1500s coin in the US !πππππ