Double Die Learning - Coin Community Forum

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Author	Replies: 4 / Views: 913
Garoyn Pillar of the Community United States 513 Posts	Posted 07/11/2015 11:45 am I am trying to learn more about errors, how/why they happen, how to identify them, etc. I got a roll of mint 2009-P dollars (accidentally, really, I didn't want a "new" roll) and thought I'd look for stuff out of the ordinary. I found stuff out of the ordinary with "DOLLAR." Is this doubling? What is this? Look at the "D." All coins in this roll have this anomaly. "Normal" 2009-P (first 2 pics) out of the ordinary (next three pics) Report this Post to the Staff

coop Bedrock of the Community United States 62064 Posts	Posted 07/11/2015 12:37 pm The last three images are show coins struck from a VLDS (Very Late Die State) die. Note the die flow lines on the fields running to the rim. That is extreme die wear. So that tells me the die is reaching retirement. But also you have die movement during the strike. This is called Machine Doubling. (actually damage to the coin) The best way to tell this from hub doubling is this the devices are reduced in size from the normal overall design. Note on your last image the reduction in size of the device? This is actually damage caused by the movment of the normal die making marks on both sides of the devices. Also note that the areas in question are like a step down. The die movement only affected part of the devices. (always reducing the devices) On hub doubling, the die is actually doubled and show a rounded enlarged devices. Machine Doubling while looking interesting, is not a doubled die and varies from strike to strike. Happens a lot on coins. (Making normal coins and damaged coins during the same run) Report this Post to the Staff
Garoyn Pillar of the Community United States 513 Posts	Posted 07/11/2015 1:06 pm Many thanks, Coop. That also explains why the coins in the roll seem to exhibit different degrees of the anomaly--varied strike to strike. So on hub doubling, you'll actually see two devices (or relevant part thereof), instead of the "shadowing" or "chatter" apparent in the above examples? Report this Post to the Staff
jdiablo30 Pillar of the Community United States 946 Posts	Posted 07/11/2015 4:12 pm http://doubleddie.com/58222.html plenty of good reads on this site about the information you are seeking. Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 07/12/2015 8:37 pm Look at these three examples. The example on the left is Machine damaged. Not how it reduces the over all size of the device? The middle example is a normal coin. Note the overall size of the devices. Note how the example on the left show both the overall size and the reduction on the upper part of the device? The last example is a hub doubled die. Note how the devices are enlarged because they are doubled on the die, thus the term doubled die. All coins struck with a doubled die will show the exact same offset. (die wear is factored in because of die wear on the outside devices. This may show less on later die states) Report this Post to the Staff
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