Why would anyone pull a cheapskate stunt like reusing a bearing that's at least 50 years old, regardless of how good it looks? A couple of carrier bearings will be a small fraction of the total cost of the job, and reusing them might be setting yourself up for a catastrophic failure- - - - -particularly if you choose to remove and reinstall them. Either do the job right, or not at all.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!