I never really noticed this before, but in last week or so I’ve seen it a few times.

Emigre’s Tribute was used in a magazine I read recently, that’s when I got interested for the first time.

http://www.emigre.com/fontpage.php?STrbR.html

Then in the Best of Finnish advertising and graphic design exhibition there was one new font, Eero Astala’s Oksa for Luonto-Liitto, and the M was there, too.

https://www.grafia.fi/index.php?sid=1208591950efd28cd2972a8109d5e215579a...

Is this kind of M common, and what’s the history of it? Can you name other fonts with M with single left facing serif?

Sorry about missing pictures, upload didn’t work.