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Machine Doubling. Lets See Them......

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Pillar of the Community
Canada
5430 Posts
 Posted 06/07/2018  8:03 pm  Show Profile   Bookmark this reply Add mcshilling to your friends list Get a Link to this Reply
You always come up with some very good educational info thanks coop.
Bedrock of the Community
26893 Posts
 Posted 06/07/2018  9:28 pm  Show Profile   Bookmark this reply Add Errers and Varietys to your friends list Get a Link to this Reply
Coop always come up with very educational threads. Thank you Coop! We all appreciate it!
Valued Member
United States
127 Posts
 Posted 06/07/2018  10:31 pm  Show Profile   Bookmark this reply Add baseballfan90 to your friends list Get a Link to this Reply
Very helpful thank you.

Here is my 1961 proof Franklin.






Pillar of the Community
United States
6643 Posts
 Posted 06/07/2018  11:20 pm  Show Profile   Bookmark this reply Add Earle42 to your friends list Get a Link to this Reply
Extreme MD on a D MM:
- When I value " being right" more than what IS right, I am then right...a fool.
- How much squash could a Sasquatch squash if a Sasquatch would squash squash?
- Prosp long and liver.
Valued Member
United States
262 Posts
 Posted 06/18/2018  12:52 pm  Show Profile   Bookmark this reply Add Ilikeabecoins to your friends list Get a Link to this Reply
My favorite has to be this 1993 LMC.








Valued Member
United States
270 Posts
 Posted 06/18/2018  10:17 pm  Show Profile   Bookmark this reply Add mikem007 to your friends list Get a Link to this Reply
1964D Jefferson nickel coin roll hunting about a month ago. In hand with 5x loupe and ability to oscillate the angle, I see doubling on everything (including the steps) -- the photo shows enough to get the idea.

I know this is not an FS nickel as the steps are a little blurry, probably from being doubled... so, I might just push my luck and request 10FS from NGC. You know, maybe they'll get a laugh out of it.

Bedrock of the Community
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United States
10663 Posts
 Posted 06/19/2018  12:50 am  Show Profile   Bookmark this reply Add CelticKnot to your friends list Get a Link to this Reply
Wow... coop, I am in awe. I can't fathom the time involved in amassing and editing those photos.

And great photography everyone else too. Very impressive!
Pillar of the Community
Canada
1956 Posts
 Posted 07/01/2018  8:53 pm  Show Profile   Bookmark this reply Add rocky to your friends list Get a Link to this Reply
wow very well done coop. excellent images lots of work here again excellent.

http://www.error-ref.com/machine-doubling/

Push doubling: Push doubling occurs when a die bounces off the surface of the coin. question: so does this mean that the reverse die. becomes the striking die. so if the reverse die is in the head. when the striking die causes this bounce. the head is damped. so that it wants to come back to its oringinal resting position. the striking die is still travelling upward. the head is moving downward. when they meet machine damage. but is that not still double struck. the head is retuning with a force. if the dampening tension is great enough. there would be no doubling. when the striking die is exerting more force. than the dampening tensioners can handle. this bounce takes place. "physics" the head as it is returningtowards the ram. so the head is now the striker so would this not be doubled die-ed. I find this very interesting would like to understand this more. coop I would like to know your thoughts or anybody thoughts.
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Canada
16109 Posts
 Posted 07/02/2018  06:43 am  Show Profile   Bookmark this reply Add Dorado to your friends list Get a Link to this Reply
1881 H Canada
1 cent.

Bedrock of the Community
United States
19688 Posts
 Posted 07/02/2018  09:14 am  Show Profile   Bookmark this reply Add just carl to your friends list Get a Link to this Reply
Fantastic information. Thanks for this. To bad after a while it gets lost as more and more posts move it to the end. I'd think this would have made a great book. Trying to find all this on utube or anywhere is not easy for us older people. I normally just put such coins in an Album and then forget them.
just carl
Pillar of the Community
Canada
1956 Posts
 Posted 07/02/2018  7:37 pm  Show Profile   Bookmark this reply Add rocky to your friends list Get a Link to this Reply
hello coop here is a new 2018 canada quarter. this coin is from the first 5000 struck coins. even new dies an new issue same problems. check the stress cracks on the whole surface of this coin. the cracks are on top of all the letters. on top of the antlers. I am wondering if this might be a result of to heavry a strike. see I think some of these coins that take a bounce. juring the inital strike. after the bounce who would know. how much pressure is resulting on a second strike from the knuckle head bouncing back. well there is no doult it is enough to flatten the first strike on the coins surface.


Valued Member
United States
116 Posts
 Posted 07/10/2018  9:30 pm  Show Profile   Bookmark this reply Add Younosabe to your friends list Get a Link to this Reply
The coin is 1971 S Lincoln penny

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United States
3866 Posts
 Posted 07/13/2018  5:13 pm  Show Profile   Bookmark this reply Add tdziemia to your friends list Get a Link to this Reply
This Ireland 1990 1 Punt coin has Machine Doubling obverse visible in the date, the country name, and parts of the harp outline (at least I think that's what I am seeing):




Valued Member
353 Posts
 Posted 07/14/2018  09:59 am  Show Profile   Bookmark this reply Add MeowtheKitty to your friends list Get a Link to this Reply
Meow found a worn nickel yesterday that has many letters doubled front and back.






Valued Member
353 Posts
 Posted 07/14/2018  10:01 am  Show Profile   Bookmark this reply Add MeowtheKitty to your friends list Get a Link to this Reply
Meow just noticed that Monticello itself is doubled on the bottom.
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