I just picked these up late last week. It is either the only one or one of only two 3 gun sets with matching serial numbers built by Bill Grover of Texas Longhorn Arms. The guns are all 41 Mag and the top is the West Texas Flat Top Target, the middle gun is the Border Special and the bottom gun is the South Texas Army. The hand tooled leather case is also serial numbered #300. I have the 4th gun of this set, the Improved #5 in 41 Mag as well but since that number had already been assigned to a previous Improved #5, the #5 is 300A.