Man searching field in Kamień Pomorski unearthed 100-mon coin made in mid-1800s Japan, possibly lost by a traveler or merchant, photos show.

It's believed to be a first — and it certainly came as a surprise: Ancient Roman coins have been found in the ruins of a castle in Okinawa, Japan, that dates to the 12th and 15th centuries.

Man searching field in Kamień Pomorski unearthed 100-mon coin made in mid-1800s Japan, possibly lost by a traveler or merchant, photos show.

Man searching field in Kamień Pomorski unearthed 100-mon coin made in mid-1800s Japan, possibly lost by a traveler or merchant, photos show.