Jump to content
CoinPeople.com

thedeadpoint

Members
  • Content Count

    17,926
  • Joined

  • Last visited

Posts posted by thedeadpoint

  1. Tell us more about this, please. Here in the Washington, D.C. region, we have the world's largest Ethiopian population outside of Ethiopia. I can spot an Ethiopian a mile away. I know their country's history is one of the most robust and distinct on the continent, especially in the middle 20th century. I enjoy learning about it whenever I can.

  2. I appreciate the thorough response and I expected that analogy. I wish I were still in college where I had access to an electron microscope; I could pop a coin inside and zoom in nice and close on the raised lettering.

    In reality, it's probably a mixture of both. The harder, more abrasive environments of streets, vending machines, and dirty pockets make more scientific sense to me. However, I have been pulling some late nights for work this week and am not thinking as clearly as I prefer!

  3. On 12/4/2018 at 12:08 AM, SMS said:

    However, we must remember that normal circulation wear does not remove any metal content from the coin so much as it simply flows the metal (spreads it out).  Thus, a worn coin will have it's devices smoothed out and apparent extra thickness and flatness as the metal spreads.

    As a materials engineer and a coin collector, I've never ever heard of that effect and politely point out that it's probably wrong. Can you point me to some literature that shows that?

  4. On 11/29/2018 at 10:14 AM, SMS said:

    Half the battle in identifying a doubled die is understanding the process by which the die is created.  A good read to start off with would be the How Dies Are Made page on John Wexler's site.

    To over-simplify it, the die is doubled when the raised image is pressed into the die and it shifts slightly.  That would be like pushing a figuring into forming foam andit shifts or you pull it out and push it in again, but not exactly in the same position.  The image will be in there twice, and at the same level.  S, when you fill it, all of the devices of the image will be the same height, yet somewhat distinct.

    The double strike, on the other hand, happens when the die strikes the planchet twice, but not necessarily in the same position for whatever reason.  The first image that was struck into the coin gets squiched down and is not the same level as the second struck image.  When viewing this, the image is what we call "shelf-like" (like looking directly downward at the steps of stairs).  The second image would appear like a shadow or a mirage image does on water.  It is apparent that it is there, but it does not stand out like the rest of the devices.

    Taking a look on the internet at images of various known doubled dies may help you to get the feel of what it should look like.  Hope that helps a bit.  And if you are not exactly sure, feel free to post photos and ask!

     

    In all my years of collecting, I haven't heard it explained this way. It makes more sense than "a doubled die shows the image rotated slightly around a common center whereas a double strike shows doubling laterally or vertically". That may still be right, but the "same depth" explanation makes sense, too. 

    However, it doesn't help when there is significant wear on the coin.

×
×
  • Create New...