while detecting yesterday in our local park i dug up this old coin,its a 1674,Charles II, Farthing,as i live in New Zealand its hard to work out how it got here as New Zealand was only discovered by europeans in 1642, Dutch explorer Abel Tasman but he didnt stay long,then in 1769, British navigator and explorer Captain James Cook came to New Zealand,so this coin is 348 years old,anybody have ideas on how to clean it,
thanks
thanks