Need help identifying a silver, bastnig spoon

Hi, greetings from Poland,

I have a large spoon, probable made from silver 0,750 in Germany, Flensburg town. The maker name? is unreadable. I’ve enclosed a few photos, also one negative to make marks seen more precisely.

Can anyone please identify the maker and/or age of the attached photos. I know that identifying this spoon will be very hard as too little data is given. A spoon is really very huge, about 36cm/14.17 inches long, and weight 204 gram/6,5 troy oz.

Please see attachment. Thanks for any help.

image 3a.jpg
image 2a.jpg
image 1a.jpg

Another two photos…
image 5a.jpg
image 4a.jpg