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Message:: [QUOTE="GDJMSP, post: 7502515, member: 112"]From the article you linked to - "Concave fields were the result of convex die faces, and this slight curvature had to be applied in a step that was separate from the actual sinking of the die."  - the underlining is mine. He says the same thing numerous times throughout the article. The dies they were experimenting with were convex. "The face of the die was then brought into contact with a polishing disc, or plate, that had a very shallow concavity to it. When spun against the face of the die, the disc imparted the same curvature profile, but the result was convex." Of course you can. If you have two convex dies, and you placed them together face to face, they will touch in the middle but there will be a gap between the two die faces at the outer edges. (Two arcs can only touch at one point, the center.) By definition that means the resulting fields of the coin will be thicker at the outer edges than they are closer to the center. But if the two die faces are flat then the resulting coin fields will be the same thickness all the way across. Anybody that wants to can measure the thickness of the fields of any coin they want to with a micrometer. That will absolutely tell you if the dies were flat or not. I would also add that I've actually held a Morgan dollar die in my hands, its face was flat. And if you set the die face down on a glass countertop, the die sat flat on the glass. It did not lean to one side, there were no gaps around the outer edge. And if the face of the die was convex there most definitely would have been gaps at the outer edges, or the die would have leaned to one side or the other. But it did not, it stood perfectly perpendicular.[/QUOTE]

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