Yes CSA buckle do exist, you're right Milly. However, i think it was the CS oval buckle that did not exist. I mean i am not sure but I do have heard several articles regarding about it. But for that specific buckle that Millander is wearing, definately exist.
However...........that's a Army of Tenn style Buckle Milly, you're portraying the rebs in east. Virginia state buckle is your best bet. I do have one and can sell it to you for a looooooooooooow price. Its a square buckle with the sic semper tyrannis lady. "Virginia" and "Sic Semper Tyrannis" can be seen. I have to find it first and i can take pic of it for you. If thats something you're interested in.