–Edit: I had M.88 where I should have had M.98 for the photo. My apologies. :( –
While not necessarily “new”, I simply forgot all about this Steyr clip (and I thought it was a misstruck H).
Anyways, it’s an X in a circle. Digging through info here I found that Fischer & Rossman of Berlin made M.88 clips and used an X stamp.
Then on this site (https://forum.ioh.pl/viewtopic.php?p=401947) I found a picture of the F&R X stamp, and it looks pretty danged similar to the ones found on the Steyr clips.
So, what do y’all think?