Red Book Terms - Coin Community Forum

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Author	Replies: 5 / Views: 1,421
The_Duke Pillar of the Community United States 1745 Posts	Posted 12/09/2009 9:08 pm Ok, here's one for all you metallurgists... The Lincoln Cents section of the 2010 Red Book says this: Lincoln, Wheat Ears Reverse (1909-1958) Variety 1 - Bronze (1909-1942) 0.950 Copper, 0.050 tin and zinc Variety 1 - Bronze Resumed (1944-1958) 0.950 Copper, 0.050 tin and zinc Lincoln, Memorial Reverse (1959 - Date) Copper Alloy - (1959-1982) 0.950 Copper, 0.050 tin and zinc My question is this, Why is the same composition referred to as Bronze for wheat cents and Copper Alloy for memorials? It appears they have the exact same composition and weight. Report this Post to the Staff

collect4fun Pillar of the Community United States 1151 Posts	Posted 12/09/2009 9:32 pm I don't know about the 2010 Red Book, but the 2009 says: Lincoln, Memorial 1959-1962 .950 copper, .050 tin & zinc 1962-1982 .950 copper, .050 zinc 1982-date .992 zinc, .008 copper with a plating of pure copper, total content .975 zinc, .025 copper Report this Post to the Staff
jbuck Moderator United States 188342 Posts	Posted 12/10/2009 3:00 pm My 2007 says the same thing as the 2009. 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
Saruma Pillar of the Community United States 968 Posts	Posted 12/10/2009 3:24 pm The 2010 says the same thing as collect4fun's 2009 edition. But I also see what you are talking about The Duke. The problem is that you read the Copper Alloy part wrong. It only says tin and zinc for 1959-1962. Since you need Tin to make Bronze, you can't call a Copper-Zinc alloy Bronze. Therefore Copper alloy was a more accurate description for the coins, although the 1959-62 coins could still be called Bronze. Report this Post to the Staff
biokemist6 Bedrock of the Community United States 12437 Posts	Posted 12/10/2009 5:33 pm with Saruma A 1982 Lincoln(last year of copper) does not have the same composition as a 1909 Lincoln. Obviously, everyone knows about the steel issues of 1943 and the shellcase bronze coins of 1944-47 but once the regular bronze composition was reintroduced, the quantity of tin was incrementally reduced to the point that it was removed entirely in 1962. At that point, you basically had a brass composition instead of bronze. Report this Post to the Staff
The_Duke Pillar of the Community United States 1745 Posts	Posted 12/10/2009 10:19 pm I see it now. I was only looking at the 1959-62. Thanks Report this Post to the Staff
	Replies: 5 / Views: 1,421

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