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Message:: [QUOTE="19Lyds, post: 2788650, member: 15929"]From what I understand, the edge lettering is ALL applied at the same time using a machine similar to an upsetting mill where the coin is force rolled around a center pivot as the lettering is applied. Similar to the process in the video below except the coins are machine fed into a spinning device.[MEDIA=youtube]ES1Go6DSiS0[/MEDIA] Thats for the circulating coinage. Proof coins get edge lettering applied using the third die, or collar in the coining press. As such, Proof Coin Edge lettering is all the orientation and all in the same location. The exception is that, during the early processes, the "third" die consisted of three individual pieces (they still do) but the three pieces were not "interlocking. As such, during the pressing of the Jefferson Proof coins, it was discovered (by a collector) that the pieces were inserted into the coin press in the wrong order. Since then, the dies have been made with interlocking edges which allows the to be put into the press in only a specific sequence. It is speculated that some of the recent "Missing Edge Lettering" coins and some of the "Weak Edge Lettering" coins is a direct result of not enough pressure being used in the edge lettering machine. This would allow coins to pass through without receiving complete or even lacking edge lettering. I could not find a video on this process except for the one above.[/QUOTE]