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My Great Grandfather used to carry around a penney from his birth year. It was always on him and he would take it out and rub it between his thumb and index finger all day as some kind of nervous tick. He did that his entire life and when he died I found that penney....it was shaped like an egg and was completely rubbed smooth after the 85 years. It is amazing what skin can do to metal if given enough time.
I did, it sits next to his old railroad pocket watch. I wish I could get that watch running again, but that is a craft that charges more than a dentist. I understand why, it is a very tedious task and there aren't that many around that still know how, but the quote was $350 to clean and service it. Seems like a lot for watch that will just sit in the drawer. I think my Great Grandpa would understand.
I'm not sold on it being solely abrasion. Some, not all, of the weakness in the letters is in the wrong places, with more wear on spots that should been protected by their proximity to higher relief aspects. Those lines are too parallel to have been created by any kind of everyday wear and even someone intentionally rubbing it back and forth over something. It would've had to have been done mechanically, and for what reason? The lines are running in the same direction on both sides as if there was a grain to the plancet. Imperfect sheet from which the plancets were punched? JMO for what little it's worth.