Close to home, try Canada near the NY/Vermont border. A lot of French and Indian War (Hundred Years War) sites that way and early explorers had settlements in the region. Maybe next time you visit the Island you can hit Cabo Rojo and have Joey look for doubloons buried by El Pirata Cofresi.
That's also awesome! Swing slow and close to the ground. Practice by digging different depth holes, place a silver coin in and cover it with the plug. Get to know the numbers the machine gives you. Then try different clad coins and Cents.
Wow, I appreciate seeing what a metal detecting find looks like from Norway! Thanks for posting, Leif Erik Johansen.