That's considered a "wartime-compatible" Steinhauer & Lück zinc Marine Artillery badge. Here's a thread on the S&L: http://dev.wehrmacht-awards.com/foru...d.php?t=702075
All S&L zincers are fairly common. The large quantity of late wartime leftovers combined with the practise of post-war assembly makes them problematic but there are no red flags on your badge.
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