Judging by the wooden sabots and the fact that I have seen a bolt and shell identical to these, I would say that they are Marshall (Texas) 3.67" Schenkl products; what makes them more interesting is that they still retain their wooden sabots. Supposedly all of these shells/bolts of this type were recovered from an overturned artillery cassion in the Red River (Provencal, LA.) area. Also, welcome to the group from middle Alabama. They have wooden sabots because the Confederates couldn't perfect the formula for paper mache' sabots like the Union Schenkl's used.