I found a Korean cash coin about a month ago in Southeastern Kentucky. Even though they aren't worth a lot, they can be very very old. Mine turned out to be minted from 1695 -1742. Lots brought over into the Western United States with Asian immigrants working on the railroads. However, in the Eastern part of the country Asians did not help build the railroads. Eastern railroads such as those in Pennsylvania and Kentucky where built by Irish immigrants. I found mine deep like you (mine was at 10 inches). This is a little deep for a coin that could have been brought back by a Korean War Vet. However, I found out that from the late 1800's to about the 1920's a fashion trend for the ladies was to have a sewing basket with these coins on them as decoration. Kinda like the Longaberger basket trend of modern times. This makes more sense to me in explaining how they got into yards of eastern areas during the turn of the century (when immigrants in this area where from different parts of Europe and not yet from Asia) and the depth they are found. A lady was sitting out in the yard sewing and the coin fell off or a child took it off their mothers sewing basket to play with and lost it out in the yard.
