To tell the difference between BONE Southern CSA and Northern Union BONE CIVIL WAR DOMININOES, look at the Brass Pins. The Southern Dominoes only have 1 Brass Pin, and it is located in the middle. The Northern Dominoes are often slightly larger and have 3 Brass Pins. Generally in the Northern Union Dominoes, the middle pin is larger than the other two.

By the way, authentic CIVIL WAR Dominoes have BONE tops and Ebony wood bottoms. To tell the difference between BONE and IVORY, see my GUIDE on To Tell The Difference Between Bone and Ivory Poker Chips.