Silver plated Art Nouveau tray, can't decipher the mark


Quick intro: I’m a French collector living in South America, my main focus is Art Nouveau/Deco, a bit of modern design too.

I bought yesterday this tray at the local fleamarket. I can’t decipher the mark, looks like two XX above (?).

I’ll try to take a better picture of the mark if this one is not good enough.

Suggestions are very welcome, thanks a lot

I found it, it’s Carl Deffner, Esslingen

Thanks for letting us know - it means we won’t have to worry about not being able to help.