From sometime in the middle ages this is an German Wallfahrt Medal (pilgrims Badge) with a beautiful depiction of St. Wolfgang of Regensburg (Ratisbon) Measures approx. 24mm  or 1 inch. Comes from an old South German collection

These medals are used for prayer as a shield or a protection against evil... this one is very old. 1 inches long and is in very fine condition. all the medals and coins and other small items I am listing at he moment come from a priory recently closed here in south east Ireland