Because of the squabbling, I didn't want to participate in this discussion... but I see that some 100%-certain facts are needed.
First... civil war era swords were not stamped with their Model-year. The date on the sword's blade is its year-of-manufacture.
Second... since a websearch for the name "Mitteh" on a sword turned up nothing, I enlarged your photo to check the spelling. I could see that the name stamped into this sword's blade is not "MITTEH" -- it is "MITTER." So, I did a websearch for that name and the word "sword." The only result I got which is relevant to your sword says a man named J. Mitter was listed in an 1853 catalog as a sword and knife maker in Austria.
Mitter Swords
That info confirms that your sword has the German/Austrian style of "P" hilt. Note that the sword's "grip" has a "backstrap" running along the full length of the top of the grip. ESPECIALLY, note that the grip's backstrap has a half-round tab at the middle of its edge. That is a crucially important ID-clue. It is a characteristic of European-made swords from the mid-1800s through early-1900s.
I also did a websearch of swords used in the American civil war. For example:
Swords
You can see a similar version of grip-with-backstrap on a German-made sword at the following link... but notice that the backstrap does not have the half-round tab.
Swords, Officer, non-regulation, F Potter
Also:
Swords, Officer, non-regulation, unknown Soligen maker
You've only showed us the sword's guard from the side. We need a full view of its top. Also need to know, is the guard made of brass or of iron.