Strange task 3

[amena]

I have the strange task of judging the competence of someone who has collected some silver marks and cataloged them.
There are brands of Italian cities, but also brands that are attributed to European cities, and I have no authoritative texts on foreign silver, so I ask the experts for help.
This mark is listed as Madrid, but I don't know it. Can anyone confirm this?

Thanks for attention
Amena

[Qrt.S]

Yes it is Madrid's control mark from the 18th century; Rosenberg #9160