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It looks like it is an original bearing, but without having it in my hand, it is just an educated guess. I don't think new bearing have the spiral cut rollers on them. You need to make sure there is no galling on the rollers. Also make sure the roller pins are in decent condition. If so, I would use it. I have an original bearing like this and I plan to use it on my 29 phaeton as I assemble the drivetrain. I don't think these bearings tend to wear a lot as there is usually plenty of lubricant around them.
Rusty Nelson