This is not far from Marty Walsh and from me. They're lovely, but I already have several, and don't have an application for another set - and I don't generally collect NOS stuff. I've had no problems with the one set that is service at our house; but it hasn't had that much use.
Weyless featured cartridge bearings with (hydrophobic) teflon seals, and feel very smooth.
I don't know if I know the seller; haven't responded, but I have no stake in this item. I do hope it "stays in the family."
harvey sachs
mcLean va