Rim Thickness Of Unstruck Planchet Vs. Fully Struck Coin?

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Author	Replies: 3 / Views: 75
Brandmeister Pillar of the Community United States 6485 Posts	Posted Yesterday 4:25 pm While CRH, I ran across a weakly struck nickel with a remaining protorim. It is 5.03g, but the coin appears visibly much thinner than ordinary nickels. I know that might be because of the convex outer surface compared to a fully squared off rim. It got me wondering just how much vertical rim thickness is gained from displaced metal during the strike. Since some of you have unstruck planchets in your collections, could you post a thickness comparison of the post-upset mill planchet vs. a struck coin? Edited by Brandmeister Yesterday 4:33 pm Report this Post to the Staff

jbuck Moderator United States 188001 Posts	Posted Yesterday 4:47 pm Very interesting. Coin Collector Since 1978 Avatar Old Avatar 7070 Eisenhower Australia Canada World CCF Members on eBay CCF eBay Search Engine Report this Post to the Staff
southsav Pillar of the Community 2223 Posts	Posted Yesterday 10:12 pm Good question, you would think it's possible the rim thickness/height would increase somewhat due to the strike. Or, someone with a blank (I don't have one) can send me one and I'll measure it. Report this Post to the Staff
Brandmeister Pillar of the Community United States 6485 Posts	Posted Yesterday 10:36 pm My speculation is that the rims will be nearly the same thickness, but a bit shorter on the planchet. The way that the protorim curves back makes it look slimmer, but I'm not sure that completely explains the height difference. Report this Post to the Staff
	Replies: 3 / Views: 75

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