Opinions Please.was This Was Caused By Heavy Die Polihing?

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Author	Replies: 15 / Views: 1,098
oldmike Pillar of the Community Canada 891 Posts	Posted 01/27/2017 01:19 am I have several of these ranging from 1984 D to 1990 D and they all have a similar ridge above the date. I am guessing this is from heavy die polishing, but I could be out to lunch. It seems strange that they are almost all in the same spot over different years. Just trying to figure it out. Report this Post to the Staff

cwb Pillar of the Community United States 3463 Posts	Posted 01/27/2017 01:27 am Could be "Progressive Indirect Design Transfer". It used to be common on the wheat cents from over using dies. The design would get transferred from one die to the other die, through the coin, over multiple strikes, causing the design to shadow through to the other side. I may not have done very well explaining this. Report this Post to the Staff
oldmike Pillar of the Community Canada 891 Posts	Posted 01/27/2017 01:38 am Thanks Claude. You explained it well, its a new term for me. Something to study up on. Edited by oldmike 01/27/2017 01:40 am Report this Post to the Staff
cwb Pillar of the Community United States 3463 Posts	Posted 01/27/2017 04:32 am This page touches on the subject, but doesn't go into much detail: http://lincolncentsonline.com/miscellaneous.html It could be something else entirely. Are the marks raised or just a shadowy part of the design? Report this Post to the Staff
John1 Moderator United States 56855 Posts	Posted 01/27/2017 04:54 am It could also be just a worn out die. John1 Report this Post to the Staff
CoinCollector2000 Pillar of the Community United States 2563 Posts	Posted 01/27/2017 09:45 am Not PIDT. Just looks like a die that was beginning to wear down. Report this Post to the Staff
oldmike Pillar of the Community Canada 891 Posts	Posted 01/27/2017 09:50 am I appears to be more of a ledge than a ridge and looks hollowed out between there and the bust. Here is a photo of the reverse of one of them Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 01/27/2017 09:53 am The flow lines indicate that the die that struck your coin is in the LDS (Late-Die-State) die state. This shows that the die is reaching the end of the dies life. (a senior die) Still in use when your coin was struck. There is a Ridge Ring starting to form on the right side above the date. The devices look thinned a bit, but not too much over polishing at this point in the dies life. Probably has a few hundred thousand strikes in it yet. Report this Post to the Staff
oldmike Pillar of the Community Canada 891 Posts	Posted 01/27/2017 10:15 am Thanks, But even in the late die state, what would cause the ridge to start in pretty much the same place over a span of several years? Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 01/27/2017 10:29 am That is one of the issues of the die deteriorating. We see a lot of this on the 1980's Zincolns on the obverse: If happens so often and posted here, I didn't even save examples of this. But it often occurs on the upper left areas on the obverse cents. Report this Post to the Staff
CoinCollector2000 Pillar of the Community United States 2563 Posts	Posted 01/27/2017 11:18 am with Coop. That ridge is so very common Report this Post to the Staff
CoinCents Pillar of the Community United States 3656 Posts	Posted 01/27/2017 12:58 pm Thanks Mike, I have a couple of my own that I wanted to post and your post here reminded me of them. They are different from ones I have seen in the past - a little more extensive than what I am used to looking at. Report this Post to the Staff
Crazyb0 Rest in Peace 10197 Posts	Posted 01/27/2017 1:08 pm I'd often wondered what that ridge was, have also seen a lot of those. Since this type of wear shows up in the '80's most often, does it become less prominent in the single-squeeze pressing in the '90's? Or is it just common for all dies to wear that way? Report this Post to the Staff
oldmike Pillar of the Community Canada 891 Posts	Posted 01/27/2017 2:13 pm Thanks, I understand the deterioration as you have explained, and I have several examples with the ridge as you show above, some more severe. It just seems odd to me , why the die seems to starts deteriorating in that particular spot on several different years. Is it the overall set up, or a strike issue, or? Report this Post to the Staff
coop Bedrock of the Community United States 62064 Posts	Posted 01/27/2017 8:58 pm This is the same read from the other thread about Die Deterioration. http://www.error-ref.com/?s=die+deterioration Covers a lot of other types of Die Deterioration. Report this Post to the Staff
oldmike Pillar of the Community Canada 891 Posts	Posted 01/27/2017 9:32 pm Thanks Coop, That gives me a bit better insight on the subject. Report this Post to the Staff
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