19th Century Civil War Era Mini Bone and Ebony Dominos 28 Complete Piece Set

19th Century Civil War Era? Mini Bone and Ebony Dominos 28 Complete Piece Set I read on an online website that Union dominos had three brass pins to hold the ebony with the bone but the Confederate dominos had only one brass pin? These dominos only have one brass pin. They measure 7/8" x 3/8" No Chips or cracks