Hi Dani
a very strange coincidence.
The mark on your mug looks to me similar to that of a tea container (I suppose) I own, which has been talked about in this post
viewtopic.php?f=12&t=36175
The decoration is also very similar.
Unfortunately the photos were lost.

At that time, a certain identification was not reached. Let's hope that this time the truth is revealed.
Best regards
Amena