oh, all right then, how do you know it's 1871, we need a pic of the engraving as proof it is dated

I've got a cavalry sword in my loft, about 4ft long, going a bit rusty, no idea how old it is, unfortunately the sheath is a bit bent and the sword will only go half way in.
Also got loads of shell cases, some have been made into ornaments, a hand grenade devoid of contents, a german helmet (no liner) and a couple of medals (not won by me)