It might very well be civil war era but......
The guard says Pakistan all over it to me. It reminds me of the invasion of Pakistani knives I saw in the late 70's- early 80's with similar construction. The blade almost looks to be plated (?) with a long narrow grind which I also remember seeing back then. The only thing that throws it off for me is the stag, they usually came with horn or some lack luster lumber attached to them. I think I have at least one (folding bowie) kicking around here someplace, maybe I'll stumble onto it. I could be wrong, but that guard brings back bad memories .
Rudy