This is a Foot-Artillery/Pioneer's Short-Sword from the period of 1853 to about 1870. Manufactured at various Austrian and German arsenals - and so marked; various inspector's stamps.
Massive "Bowie-like" in design.
Overall length is ~25".
Hilt is ~6-1/2" in length and is constructed of iron; cross-guard is ~5" in width; grips can be found made of horn or wood.
Blade is ~18-1/8" in length.
Can be found fullered on one or both sides of blade and model designations change accordingly (Model 1853/1862).

It has been suggested that these were imported by the South prior to the outbreak of hostilities in the American Civil War. I can neither prove - nor disprove - this claim.
"It is well known that Austrian weaponry was used by both North and South during the American Civil War. The question has always been "what types," but never "if at all." The best-known weapons were the M1842/49 Light Infantry Musket Jagerstutzen M1842 with sword-socket Bayonet; the M1854 Light Infantry Musket Jagerstutzen M1854 with sword-socket Bayonet; and the M1854 "Lorenz" Infantry Rifle Infanteriegewehr M1854 with 4-sided-angular socket Bayonet (of which 47,000 were used by the Confederacy alone). I have researched the firearms and their bayonets, but I have not been able to research - with any success - the types of hand-held edged-weapons purchased from Austria. I am sure there are a number that made their way over with the afore mentioned firearm/bayonet purchases."
"The South had a good working relationship (or liaison) with the Hapsburg Monarchy as is reflected by the uniform dress of the armed forces. Confederate uniforms were styled after the Austrian pattern - even down to the color (gray) - whereas the North copied the French blues."
Without provenance, however, the rule of thumb is that, "for it to be Confederate, it must say "CS" or "CSA," be from one of the know "Southern" manufacturers, or be typical of what was produced in the South - based upon confirmed known examples - just prior to and during the Civil War."