Wow, thanks a lot for identifying the mark! That's very helpful.
As for the ceramic mark, here are a few examples.
And personally, I'm wondering about this mark since 2011! Here's a question I posted in 2011 regarding the same mark (meanwhile, I met other collectors who have ceramics with the same unidentified mark... Nobody knows!) :
http://placedelours.superforum.fr/t6242 ... -et-cuivre
Some have galvanoplast mounts, but some others (like the one I asked about in the current thread) have nice silver mounts... Mystery!
Again thanks a lot!