Here's why I think this has been polished...
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If you look at the polished strip that you indicated could be made wider by polishing, it has what I would say are very obvious striations along it that come from poor refinishing. Rather than being random, they follow the contour of this polished strip, indicating they were put there during a polishing operation and are not from random wear and tear.
These are indications of someone most likely using a buff that had not been properly prepared/maintained.
Cheers, Al
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