I've looked at a million different websites, read several books, and posted multiple questions and for some reason, I just can not seem to figure it out. Every time I post something I'm told its machine doubling or Die Deterioration. I can't determine the difference... I'm thinking that maybe if I actually see it in person maybe I will be able to tell the difference. So here are some pics of coins that I think might have doubling. Please let me know if any of them actually do or if I'm still way off. Thanks!
Unfortunately no, but you do have a nice die chip in the 5 of the 1957 LWC though. It’s tough just starting out, hang in there. When things get normal and you have a chance stop by a local coin shop and look at some in person. You might check to see if there are any local coin clubs in your area and see what some of the members have. Just keep reading and posting what you find.
I hear what you're saying about it being difficult. To me the easiest thing to look for is that on the true doubled dies you'll see notching at the corners and on the serifs.
@Kellyrae18 This diagram is misleading because machine doubling is not curved between the horizontal and vertical planes. It should be a 90 degree angle between the two faces. ~ Chris
Not double, it's a common Filled "S" Mint Mark as opposed to a clear "S". Its the difference between a Type-1 and Type-2 1979 proof set actually. Bad quality control when forming the mint mark on those. Here is one way to understand the doubling problem in coin manufacturing: -Think of the difference between true HUB doubling (Double DIE) and machine doubling as the master hub that is used to make Working Dies is the cause. The Master moved/shook when transferring the image to the working Die that strikes the coin (All coins struck with that impaired Die will be truly doubled) vs a single coin shook/moved in its retaining collar when struck with a perfect working die. (A single or a sparse few coins are impaired) A true doubled die is normally : not always: pretty dramatic. Look carefully at the Lincolns of 1955, 1972 DDO & 1983 DDR. Machine doubling is caused in the coin press normally very slight and weak. Barely noticeable by eye.
I thought it was a "squeeze" process so there should be no vibration or shaking like you would typically find in the coin-making process. The doubled working die created during the squeeze process is caused by a misalignment between the working hub and the working die. ~ Chris
This is an example of die doubling. Do you see how the images are intact but just set off from one another? They’re the same height but one was struck over the other just enough ajar to see some of the other remaining. This all happened when the die was made and it shows on this coin that was struck with that die. In strike doubling the die was perfect but the planchet slid or hopped when it was struck leaving the distorted image. In die doubling there will always be two images the same height off the coin side-by-side with one superimposed over much of the other or adjacent to a degree or another aside the other.
Yes, but the die blank comes to a point. As the hub is squeezed against it and starts pressing in the design the pressure kind of wants to make the die blank "get out of the way" and can cause a lateral shift before it can't move anymore. If part of the design has started to be formed before it shifts it now kind of "starts over" and you can get some doubling of the design in the die. This is why the single squeeze doubled dies tend to be doubled close tot he center of the coin as that is where the blank and the hub first make contact.
