You were probably looking for this post.
viewtopic.php?f=8&t=52410&hilit=CROFF
But your mark doesn't look like the one in this post, be it real or fantasy. it is similar to that of Venice, which represents the Lion of San Marco. Here are some examples. (Note that the last two ones are suspect).
![Image](https://i.postimg.cc/XrPwBspW/moleca-4.jpg)
The repair seems to have been done with tin, is it ?
Usually I always check if the object is really solid silver, just to remove any doubts.
I apologize for my poor knowledge of English, but what exactly does it mean "explain the screw" ?
Best regards
Amena