Bonjour neekee
I am the contrary to an expert but ...
The hilt is made of white brass, or German silver or, as i think you call it, metal argentee, same as used in cutlery.
The steel blade has a chromed finish because, at this stage (1882-1904), swords were no longer for combat, but for cerimonial uniforms. If it has been frequently sharpened, as you notice, must have been for the amusement of a later owner that not for going into battle.
The inspector ponçons you may identify them if you browse the Net for the Châtelerault site or other written publications .
I guess the three crosses are just ... three crosses; a mark like any other mark
