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<p>[QUOTE=&quot;bonbonbelly, post: 1493629, member: 22931&quot;]I have a theory about these that I thought of when I first got a bunch of Washington dollar rolls and found a lot of coins with this pattern. I do think it is grease related. Grease does not compress well under pressure, it looks for any way out. If the die has just received a coating of grease, any excess will be forced towards the edges during the next strike. This film would be under enough pressure to affect the surface of the struck coin as it passes across it. Depending on the speed of the press (coins per minute) and the frequency of applying lubrication, this may happen to many coins per hour of production. Cool to look at but I believe it is just part of the manufacturing process.[/QUOTE]</p><p><br /></p>

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