Hub doubling/Mechanical doubling

Mechanical doubling and a worn die (die deterioration) are caused by 2 different things, so "worn die" does not apply to all.

MD relates to the improper installation of a die, a "worn die" is a coin struck by a worn die.

 

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MD or loose die, once tighten, all good to go

 

Maybe so, but it's still different than a "worn die".

 

Here is a link too some of my doubled dies with the explanations as too what causes it to happen http://coins.www.collectors-society.com/WCM/CoinCustomSetView.aspx?s=15326

 

Mechanical Doubling originates in the coin manufacturing process. Doubled Hubs and Doubled Dies originate in the die manufacturing process. Addressing the issue of mechanical doubling occurring randomly throughout the coin striking process. This is both true and untrue. The mechanical reasons a coin press begins producing MD coinage may appear randomly but once these conditions are present the press will consistently produce MD coinage until these conditions are corrected.

 

View attachment 330046 View attachment 330046 Let me know what everyone thinks caused this one. It is graded by NGC MS68RD. You can see some doubling on LIBERTY, the date and some from the bridge of Lincoln's nose down through the chin.

 

This would be MDD...note the tops of RTY of LIBERTY and the profile, very typical Machine Damage Doubling.

Larry Nienaber

 

Agreed with larry. This one is mechanical doubling. Notice that the doubling is flat and shelf-like, and if you "remove" the doubled part, the design would appear smaller than normal.

 

Here is an example of a doubled die (50c 67 BS DDO-001) with Machine Damage Doubling (MDD) on it.
Larry Nienaber

 

Thank you for the info. Even with the collection of doubled dies I have I am pretty new too learning about the causes

 

Ok I have another one to ask about. I know that this is classified as a Wexler WDDR-002 die variety. This coin is in my collection and still has a fairly low population. I know there are at least 10 varieties. Will NGC or PCGS recognize these in the future? These pictures are from my coin View attachment 330069 View attachment 330069

 

Also, is this consider a real doubled die in the same sense as the 55DDO or the 72DDO etc?

 

I love the formative years DDRs. gijoe, what do you use to take pics of your coins?

 

One of the fellow coin talk members takes my photos. Let me see if I can get him to reply too your question