It looks like a Marine Flak Abteilung to me, but I can't help you with the 'L'.
Maybe someone else has better reference material.
This is what the 'Feldpostübersicht der Deutschen Wehrmacht' VMD says about 29680:
The only thing that bothers me, is the 'L' prefix.
According to the 'sticky' from Ian Jewison, second at the top of this page, an 'L' prefix stands for Luftwaffe.
So why I find Kriegsmarine Feldpost information is a bit of a mystery to me...
Maybe he can help you out???
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