Buddy of mine dropped off a pile o' primers. I've not seen these before. From what I can find on the internoodle they are mid 1970's made in a joint effort with Fiocchi. I'm gonna give them a shot and see how they do... Gosh these days I just can't even think about not giving them a go.
As an edit, at the top of the primer cup it almost looked like a serrated edge, rather than the clean cut / stampings of the CCI I usually use. Noted that they seated harder than the norm as well- perhaps because of the rougher leading edge. The best news is they all did their job, no misfires. Might be the best part of 50 years old... but ...