1970 S, Possible Date And Mintmark Doubling

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Author	Replies: 5 / Views: 869
Taylorism New Member United States 48 Posts	Posted 09/22/2020 12:05 am Found this 1970 S cent today. I am still learning to discern Machine Doubling. I believe this is what I have here. Your thoughts? Also, any tips on how to tell apart double dies from Machine Doubling would be great! Any input is appreciated. Thanks! Report this Post to the Staff

SamCoin Pillar of the Community United States 3237 Posts	Posted 09/22/2020 12:09 am Classic Machine Doubling. Note the way the size of the devices has actually been reduced by the doubled areas? That is caused because the bounce of the die that produces Machine Doubling crimps down the raised features of the coin and reduces them, unlike a doubled die where the device negatives on the die itself are actually doubled, which enlarges raised design features on the coin. Also note the flat, shelf-like appearance of the doubled areas. On a true doubled die, these will have the same gradient as the main impression of the devices, since they are imprinted into the die as part of the same hubbing process. Report this Post to the Staff
Taylorism New Member United States 48 Posts	Posted 09/22/2020 12:22 am Yeah the shelf-like appearance of the potential doubling has been my biggest giveaway so far. I like the point about it actually being reduced. As you point out, true doubling would create more, not less. Are there any books that you would reccomend to learn about the actual minting process. I have been reading books about the design of coins and the history of minting, but would love to learn more about the actual process. Report this Post to the Staff
John1 Moderator United States 56855 Posts	Posted 09/22/2020 04:59 am Just an added FYI: it is a large date. John1 Report this Post to the Staff
SamCoin Pillar of the Community United States 3237 Posts	Posted 09/22/2020 09:57 am I recommend reading the descriptions of the various classes of die doubling on John Wexler's website as well as his section on "worthless doubling." I've been in this hobby a reasonably short time and have found that unless you're trying to get to like a PhD level knowledge of coins and delve into the archives of the US mint, all the information you really need is available for free online. Report this Post to the Staff
ijn1944 Bedrock of the Community United States 19195 Posts	Posted 09/22/2020 10:45 am Nice example of MD. Report this Post to the Staff
	Replies: 5 / Views: 869

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