What would you call a bowl impression ?

I kept wondering why I was having so much trouble getting this coin in focus I've kept getting a shadow as indicated in the photo finally I had to pull it out away from the stand in order to lose the shadow I'm just wondering what they call this bowl shape I've seen partial bowl shapes as indicated in one of my threads but not as symmetrical as this one enjoy

 

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Not sure what it's called, if it even has a name, but I believe it's just an artifact from a vlds die. Nothing special

 

Would you give us a photo of the reverse?

Chris

 

concave/convex or just plain bent. does it lay flat? pics from all sides, edges included.

 

Chris you can view photos of this coin on my thread 2016 P Shawnee die crack thank you for viewing

 

No sir not bent lays flat no distortion on reverse can see other photos of this coin go to my thread 2016 P Shawnee die ceack view additional photos thank you for your quote

 

Why not just post pics here since you want answers? Not nice to make people jump around... And I *think* @krispy was referring to the die being convex from wear

 

You're right should put the reverse on this one my bag Did not want to double pose photos completely different threads easier to tell members to look at the other thread for additional photos instead of double posting photos. Did not intentionally mean to inconvenient you or any other member I guess it would be okay if it was a link when a member wants to know something about a coin gives them a site to go to I guess is not appropriate to give a coin talk link to answer another member's question. Oh well have a nice day.

 

Really can't tell much from these pics unfortunately. Try diffuse light and if you have a shot from an angle showing the surface has this feature it might be easier to see too

 

The photo I am providing is a frontal take notice what angle that I have to have in order to get rid of the shadow in order to see the interior The first photo is up against the backstop this photo I had to pull out over a quarter of an inch in order to be get rid of the shadow still working on my lighting

 

Well I guess I'll have to call it what it is to me this is a ME machinist error.ME coin Not a bad designation If I do say so myself

 

ps The original photo posted tells the whole story only one other photo may be needed that's the reverse the focus is the depression in the coin and due to the lighting this is well indicated in the first photo that shows the depression adequately thank you for your quote

 

I think you'll like these photos the first two or with a straight adage on the 2016 the second two is with a straight edge on a 2015 unfortunately I had to take two photos of each because I couldn't get the whole coin in the photo

 

Just seems like shallow dies / worn and perhaps a combined weak strike.

 

Not a worn die or worn coin like stated early it's an ME. Coin thank you for your quote

 

As you're asking here with uncertainty, that's my assessment based on the images provided and from seeing it on other types of coins. And since there's no such established numismatic term ME there is also no certainty it's what you've decided to call it. There's an error expert who is a member of this forum that may be able to help if Mr Diamond can be contacted. Images may not be enough but you may be able to send the piece to someone like him for inspection in hand if necessary.

 

Quite informative anything is possible but very few solutions the one I proposed is a logical solution and explains the coin. One that I found does not come up much since you do not blame the machinist that actually made the die in this case I am blaming the machinist that made the die he messed up he left a 1 to 2 center meter high spot in the center of the die that would explain exactly how this error occurred but that is only my opinion and to me it is the most logical one it is a machinist ERROR until proven different to me. That is why I am calling it a me coin short for machinist error in short a high spot in the un-engraved die would cause an impression in the coin like this one logical

 

I hope these photos will help explain what I'm trying to say. What I am using is For a gauge is a piece of Avery label stick-on's this will give you the idea of the thickness, I'm not exactly sure the only gauge I have to check it with would be an automotive steel gauge will use metal on coins. The first coin I'm showing you is a 2016 notice the space between the paper and the straight edge this shows you the excess height of the metal on the die now I will show you a 2015 using this same straight edge and the same piece of paper notice between the paper and the straight edge no visible gap.

 

I understood what you are saying but don't think the mint has the same tolerance expectations nor that they prepare dies in such a manner as you expect they ought for these mass produced business strike pieces. As such the error type you've conjured up with sincere logic is one not widely accepted as such as a recognized error category and by the broader hobby and by grading experts would be some other type of flaw if at all accepted as a designation worthy error. Therefore I propose having it reviewed by those experts with weight in the hobby and grading industry to compare their response to it, and your own evaluation.

 

Sir I agree with a lot of aspects you're presenting but usually a machinist is not pressured when cutting a new die generally we call these a Monday or a Friday miscalculation, in a hurry to go home or plane just don't want to be to work on Monday in 16 years that I've been collecting I've only ran across a few of these most of the time the tolerance is held up to standards and by my measurements this particular die had a crown of 0.8 mm I personally may not have the experience of a lot of experts out there but I can conduct the same tests that they would and as you say the classification of this coin is in question error or not I'll have to go with if the visual appearance of a coin is noticeable and is not caused by PMD we'd have to assume this is some form of an error ? I just found my micrometer will be doing some more measurements and I'll have a weight on my next post and I have learned on this site there are experts out there who do watch this site. Unfortunately they do not weigh in on discussions like this if they did they would not be able to make any money, by having someone send the coin in to get their opinion. Years ago I had a friend that had a well-known error. He decided he was going to send this coin in to be graded and get a professional opinion he sent the same coin into three other graters at the time this coin came back with four different grades and opinions, and at this time to get a coin graded it cost you an arm and at least a big toe in cost. I personally do not expect any professional greater to give their opinion on this thread it would be bad for business. I am always willing to increase my knowledge if anyone has a better explanation for this bowl shaped go for it..