The town mark appears to be that of Danzig (today Gdansk in Poland). I don't have sources to identify the maker's mark but maybe someone with more knowledge about German silver can help you. I don't think they are Hanau pseudo hallmarks as there are only two marks; usually there would be more. But without seeing the whole item it's not possible to say for sure.
Hello Sasropakis Many thanks for information. Actually I found other posts where I could see the Danzig hallmark for comparison. Too bad that many are now without images. Sincerely Amena
It is a tankard that will be auctioned From the photos it looks beautiful, but I don't have the chance to see it with my own eyes. Thank you all for your help. Amena