Need help with indentifiying german Ammunition

Hello my friends, i recently visited the beach and found a bullet casing in the water on which the front end is a little bit damaged, but the writings on the bottom are still readable
If someone knows where this bullet is from i would greatly appreciate it, i searched on google and it looked most familiar to a MK103 but i am not quiet sure about that.

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the writing says: 21m at the top, on the right it says: P414 which is the ammo factory that it got produced at, on the left it says: 37 and at the bottom it has a eagle and small numbers which i cant make out to well but it should be: Wa4231
it has not been fired yet


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