Ken. It is a ball bearing. Didn't you buy one of these? I'm certain it is made in Spain.
I did order a Vertex ball bearing chuck from amazon.ca but it was temporarily out of stock so I cancelled the order found an original Jacobs ball bearing(14N) for sale, I bought that instead, it cleaned up very nicely, I am 100% convinced it was a better choice.
If you go with that option, you may bring it back to silky smooth with some penetrating lube spray like Kroil , then you got a brand new ball bearing chuck with hardened jaws and all for a fraction of a new Rohm chuck. I think that is not a bad move .I'm thinking about taking this one apart but don't want to void the return.
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