Abilene, thanks for the information pard, my pair are X016xx. As I remember it, you were doing a lot of Cimmaron work back when and I sent this pair to you for rechambering. You stretched them from the 44Colt to 44spec caliber for me. I wanted them to be ammo compatible with a 44spec '66. Hopefully someone can narrow the numbers down even more, though it will probably not influence my decision to sell them. Just curious.