I told myself that the previous one I bought would be my last but this one presented itself on EBAY for 43 dollars and I had to take a stab at it (and got it!). It has a diamond shaped maker's mark but the core seems exactly like my CD 800 core (shown next to it). Another replaced ribbon ring?
Also have a picture of the super rare Chinese Dog EK set worth well over 10,000,000.00. I'm taking offers presently for those interested : )