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 Replies: 10 / Views: 2,090 |
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Moderator
 Canada
10458 Posts |
"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 OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_USMy eBay store
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Pillar of the Community
New Zealand
1679 Posts |
Very nice
Cheers Don
Vickies cents and GB Farthings nut.
"Old" is a figure of speech and nothing more
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Rest in Peace
10197 Posts |
You do know it is just machine damage I hope, not a "double-strike(struck) which is a true function, when making Proof coins. MD can bounce in multiple directions and times on the same coin. Don't misuse the term, at least I think that's what you are referring to and not a doubled die.
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Pillar of the Community
Canada
2426 Posts |
Nice!
Its making me dizzy looking at it.
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Moderator
United States
23522 Posts |
Quote:
You do know it is just machine damage I hope Physically impossible for Strike Doubling to manifest this way, and it's a coin known to be struck twice in production. Therefore, too slowly for MD to happen. Keep in mind, MD is a manifestation of a specific range of die speed and machine condition. Too fast, and there's not enough dwell time for the die to shift. Too slow, and "shelving" won't occur no matter how loose the die is. It'll just do something resembling a conical strike. The question I want to answer first is, "Can the second strike obliterate the first one this neatly and completely?" If that's the case, then we explore one set of possibilities; if not, maybe others. |
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Pillar of the Community
Canada
2519 Posts |
An extreme example of flat field doubling?
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Moderator
United States
23522 Posts |
Quote:
An extreme example of flat field doubling? That's my working theory, but I want to hear other opinions. |
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Moderator
 Canada
10458 Posts |
"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 OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_USMy eBay store
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Moderator
Canada
10458 Posts |
Quote:
Can the second strike obliterate the first one this neatly and completely? When it comes to nickel coins, especially nickel dollars... absolutely!! Have a look at other examples in various denominations. A 1977 25c struck over a 1975 5c  A 1978 1c struck over 1977 5c  "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 OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_USMy eBay store
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Moderator
United States
23522 Posts |
Then I'm inclined to agree with Altaira, although the offset is rather extreme. Quite the fascinating coin.
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Moderator
Canada
10458 Posts |
Except the tops of the letters and other devices are not fully struck up, because the first strike had flattened the metal to field level... The letters and beads, are not fully struck...
"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 OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_USMy eBay store
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Replies: 10 / Views: 2,090 |
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Posted 11/27/2017 6:21 pm
