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For sale is a PAIR of ABEC 7, Superprecision Fafnir ball bearing 3MM209WI DUL. Open the two PDFs and search for 3MM209WI, you will see cross reference information. A McMaster item 2385K19, bearing some similarities, costs $297 each. So here you have a $600 part.
Based on what I saw, this is a 7209 bearing, just fancy because of ABEC 7 classification. But I am an amateur, mostly good at googling but not at high precision bearings. 45 x 85 x 19mm (1.7717 x 3.3465 x 0.7480")
Supposedly good up to about 20,000 RPM, superprecision bearing has some amazing qualities not seen in lesser bearings. I made the profound statement above, mainly because I have nothing real to say but want this auction to seem more sophisticated.
While I opened the cardboard box, I never opened the plastic wrap. Includes a little manual.
