Dear Diane, Your find is a communion token, very common usage in Church of Scotland and some Free Church congregations from the 17th-19 centuries. They were handed out to parishoners whenever it was announced in advance that communion would be held on a Sunday several weeks away. Many hundreds of different types are known from parishes all over Scotland. However, some are quite scarce and high sought-after by collectors. Very small rural parishes, especially those in Orkney, are hard to find. You have found a real treasure and there is probably a connection with the home parish of your ancestors. All best wishes, Doug Nicol, Santa Rosa CA