As you can see, it's a late version of the old champion lug, with small mallet logo, with threaded insert and spring, the same that those of the early phonic (with square badge). Very similar to a modern lug actually. And definitely bulletproof.
After removing grease gunk (the former owner loved spreading workshop grease all over, instead of focusing on the thread itself. Jeez.) and some polishing, I'm sure they'll look great.
