1968-1987 Nickel Dollar Flat Field Doubling

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Author	Replies: 3 / Views: 1,769
pginrh Valued Member Canada 456 Posts	Posted 12/07/2011 12:04 pm Having just started collecting Nickel Dollar varieties, I see a number with light doubling of the Obverse legend. Looking at the 1960 Charlton Variety section it talks about Flat Field Doubling and refers to Specimen coins. The definitions of Flat Field Doubling that I find online seem to infer that it is a result of a double strike for proof coins, yet these coins are P/L or business strike... can anybody give me more of an insight into the mechanism of Flat Field Doubling. Edited by pginrh 12/07/2011 12:09 pm Report this Post to the Staff

SPP-Ottawa Moderator Canada 10463 Posts	Posted 12/07/2011 1:00 pm I think it depends on the years. For 1968 to 1975, I think it is Machine Doubling damage (MDD). The offset or doubling is more pronouced as you get farther away from the centre of the die (i.e., closer to the rim). From 1976 to 1978, it may be either MDD or Die Deterioration Doubling, or a combination of both. I highly doubt coins are double struck. Everything changes in 1979. Different design, different quality of strike (business strike) properties (lower speed or lower pressure?), but the flat field doubling all but disappears except for the 1980 and 1982 constitution dollars. "Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert Oppenheimer Content of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_US My eBay store Report this Post to the Staff
pginrh Valued Member Canada 456 Posts	Posted 12/07/2011 3:22 pm I found a reference by Ken Potter to "single strike flat field doubling" but no details about how the doubling mechanism occurs.... his pictures look like they match the type of doubling that I see. It may be some form of Strike Doubling, but it is unlike any MDD that I have seen. Edited by pginrh 12/07/2011 3:24 pm Report this Post to the Staff
pginrh Valued Member Canada 456 Posts	Posted 12/08/2011 1:36 pm Sorry, just noticed a typo in the first entry... I meant to say 60th Charlton NOT 1960 Charlton. Report this Post to the Staff
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