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<p>[QUOTE=&quot;Cliff Reuter, post: 7499647, member: 115140&quot;]Good question and images by the OP. And an interesting question.</p><p>Even though no one asked for it, here are my two cents. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie39" alt=":cyclops:" unselectable="on" unselectable="on" /><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie39" alt=":cyclops:" unselectable="on" unselectable="on" /></p><p><br /></p><p>IMHO, these die flow lines <u>are</u> caused by metal flow towards the rim. The longer a die is used the more pronounced the lines get. (Sort of like wrinkles on a bikers face from the wind as they get older.<img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie11" alt=":rolleyes:" unselectable="on" unselectable="on" />)</p><p><br /></p><p>Since the planchet is smaller than the collar die, the metal must flow to the edges to fill the collar. The closer the metal is to the rim the more it is affected with movement. <span style="color: #0000ff"><u>This radial movement towards the rim is evident by the depth of the die flow lines in the OP&#039;s images.</u> <u>They are deeper and wider towards the rim than the central part of the coin.</u></span> The metal in the central part of the planchet flows <u>up</u> into the deeper central devices, but the metal in the field flows towards the rim to help fill the collar.</p><p><br /></p><p>BTW- My understanding of the reason for the proto-rims on the planchet is to help form the rims and protect the details on the coins from circulation wear. I&#039;m sure that helps reduce the metal flow towards the rim but it doesn&#039;t eliminate it.[/QUOTE]</p><p><br /></p>

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