Authentic Civil War .69 Caliber Musket Ball Recovered At the Dunker Church Antietam Recovered By Dean Thomas. A fired musketball .69 from our collection. We have several and we will pick the best one for you. Most are fired. One side says “Dunker Church” some have Dean Thomas’ numbers. Legendary Relic Hunter, Author, and historian Dean Thomas had permission to hunt the part an area near the church that was private property (now it is owned by the National Park) so there will never be any more relics coming from this area. Considered by most historians the bloodiest single day in the Civil War. Very limited supply. Comes With Museum COA.