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Message:: [QUOTE="GDJMSP, post: 2898934, member: 112"]And interesting document and I thank you for posting it. However, this is rather pertinent to the discussion at hand and it comes from that document. "October 1987 Final Report This research was undertaken to determine the feasibility of automating the polishing process of proof dies at the United States Mint, The dies polished during this research endeavor were the obverse Kennedy half-dollar dies, While most of the techniques used in this study are new, some of the techniques developed by Sidney Weiser (Phase 1 December 16, 1985 and Phase 2 December 3, 1986) were incorporated into the polishing procedure. " My point is this, those methods you describe of using polishing wheels that are 3/4" in diameter were not used until those dates you also see above. And the coins were talking about were minted before those methods of polishing dies were ever used. From the late 1800's on, and maybe even prior to that, dies were polished by machine using large polishing wheels that made it impossible for the wheel to touch the devices. Only the fields were ever polished. I would also like to point out that while these more modern methods using tiny polishing wheels are sometimes used, great care is taken to not ever touch the devices on a die with those wheels. Only the fields of the die are polished. But yeah, I'll admit that a mistake could happen. One last thing, the US Mint has provided videos of how modern business strike dies are polished, links to these videos have been posted here before. And the die polishing is still done by machine, fully automated, using large polishing wheels that make it impossible for the devices to be touched during polishing.[/QUOTE]

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