It appears to be a butcher knife with about 3" of the tip broken off. The age could be anywhere from 1860 to 1960.
The best way to restore it would be to clean it up minimally, install plain wooden handles ( hickory or walnut) and use cutlers rivets. You can use steel, brass, or copper...as all were used on these type knives.
Don't sand off all the patina and age. If it is to be used, sharpen it, but leave the flats as they are.