We all regularly come across difficulties in identifying mint marks. The forum and Numisdoc are full of information but scattered and not easy to find. For the referees, it's a lot of work, moreover uninteresting, to specify every time FM means Franklin Mint etc.
I propose to group here the info, raw or in the form of links, on the subject, with key words like "mint marks Country xx" to make searches easy.
I will start by setting some examples trying to avoid long forum threads where info is hidden in the discussion and let all of you add info and good links.
Equivalent thread on fr forum : https://fr.numista.com/forum/topic58071.html