M1891 7.62x54R bullet


#1

When younger,clueless me found this cartridge 3-4 years ago,i pulled the bullet out with pliers. Since it was rusted and dirty,i used sandpaper (facepalm) and sanded it,scratching and ruining it. I was bored so i pressed the casing (second facepalm),then threw it away (third facepalm). I believe that this one is rare. Can anyone confirm that? So,even tho i ruined it,is this single projectile of any value? Or is it something you can find easily?
Here it is by itself and between 7.92x57mm M75 and 7.62x39 M67.


#2

To me, it looks like a Belgian Mauser (7,65 x 53, M1889). But without dimensions, that 's just some speculation.