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<p>[QUOTE="yakpoo, post: 7787610, member: 18157"]My understanding is that the collar (the 3rd die) is comprised of segments that open to accept a blank then closes in tightly as it readies for the strike. I imagine that if the planchet was larger in diameter, there would be noticeable spikes on the edge where the collar can't quite close together...and a slight broadstrike, but that's just a guess.</p><p><br /></p><p>"Particularly of interest were the several references I found to the three-piece, segmented collars used for coining Saint-Gaudens double eagles. Examining the edges of this coin type you will find three raised lines running at right angles to the coin's obverse or reverse. These are the parting lines where the three pieces of the <b>retractable collar</b> met one another at the moment of striking."</p><p><br /></p><p><a href="https://www.ngccoin.com/news/article/804/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.ngccoin.com/news/article/804/" rel="nofollow">https://www.ngccoin.com/news/article/804/</a></p><p><br /></p><p><img src="http://www.coinnews.net/wp-content/uploads/2013/04/045-Coin-Die-Installed-into-Collar.jpg" class="bbCodeImage wysiwygImage" alt="" unselectable="on" /></p><p><br /></p><p><a href="https://www.coinnews.net/2013/04/17/u-s-mint-at-san-francisco-coining-press-room/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.coinnews.net/2013/04/17/u-s-mint-at-san-francisco-coining-press-room/" rel="nofollow">https://www.coinnews.net/2013/04/17/u-s-mint-at-san-francisco-coining-press-room/</a>[/QUOTE]</p><p><br /></p>
[QUOTE="yakpoo, post: 7787610, member: 18157"]My understanding is that the collar (the 3rd die) is comprised of segments that open to accept a blank then closes in tightly as it readies for the strike. I imagine that if the planchet was larger in diameter, there would be noticeable spikes on the edge where the collar can't quite close together...and a slight broadstrike, but that's just a guess. "Particularly of interest were the several references I found to the three-piece, segmented collars used for coining Saint-Gaudens double eagles. Examining the edges of this coin type you will find three raised lines running at right angles to the coin's obverse or reverse. These are the parting lines where the three pieces of the [B]retractable collar[/B] met one another at the moment of striking." [URL]https://www.ngccoin.com/news/article/804/[/URL] [IMG]http://www.coinnews.net/wp-content/uploads/2013/04/045-Coin-Die-Installed-into-Collar.jpg[/IMG] [URL]https://www.coinnews.net/2013/04/17/u-s-mint-at-san-francisco-coining-press-room/[/URL][/QUOTE]
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What happens with an oversized planchet?
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