ID needed on 1897 .303 bullet

I have recently acquired a lot of military bits and pieces and this bullet was in the lot. It is dated 1897 with the marks DM and under that the letter K. Can someone tell me what this is please?

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It is a 7mm Mauser Patrone made, as already said, by the German company Deutsche Metallpatronenfabrik, Karlsruhe in 1897.

Thanks Jim, I will move it on as I am a badge collector any ideas of a value?

I picked one up for $1 a couple of years ago.