1970 D Roosevelt Dime Reverse Subsistence 1 1

[Cary Coins]

This 1970 D Roosevelt Dime appears on the Reverse to have die subsistence colliding with RICA in America and the surrounding leaves.  Can you please confirm?

[Coinbuf]

Where did you get the term "die subsistence" from?

[Henri Charriere]

I am going to guess you are referring to the substantive damage sustained by the coin sometime during its 50+ years in circulation.  It, to my untrained eye, appears to be nothing more and nothing less than inexplicable, garden variety PMD.  

[Cary Coins]

https://www.error-ref.com/?s=die+subsidence

[Henri Charriere]

On 3/6/2024 at 5:47 PM, Cary Coins said:

https://www.error-ref.com/?s=die+subsidence

Oh, I get it. The field was inundated compromising the underpinning resulting in the subsiding of the surface.  My diagnosis still stands.

[Sandon]

    "Subsidence" and "subsistence" are different words with quite different meanings. The posted coin may exhibit reverse die subsidence (not "subsistence"), or a portion of its reverse may have been struck through some soft or thin material that caused the depression but allowed the design to still show through it weakly.

[Coinbuf]

On 3/6/2024 at 3:47 PM, Cary Coins said:

https://www.error-ref.com/?s=die+subsidence

Ok, as sandon noted your terminology is close but not correct which is confusing.   You coin may exhibit the effect of die subsidence, it could also be from localized high heat and other issues.  I'm not sure this can be solved from photos alone.

Edited March 6 by Coinbuf

[J P M]

It also could be a lot of years of banging around. I have some bumps I can't explain but there they are.

[Greenstang]

It is also possible that it is a plating bubble.

[VKurtB]

On 3/6/2024 at 8:18 PM, Greenstang said:

It is also possible that it is a plating bubble.

Plating? What plating? It’s clad, not plated. We do cladding. Canada does plating. That doesn’t mean it couldn’t have been a torch heated bubble job, which is the most likely explanation. You could fall below the subsistence level waiting for that thought to subside. I’ll wait. 

[Henri Charriere]

On 3/6/2024 at 9:18 PM, Greenstang said:

It is also possible that it is a plating bubble.

I do not know the first thing about plating bubbles but what the bubble left behind was, by whatever term used, a depression or subsidence of the surface due to lack of sustenance resulting in bas-relief.  🤣

[powermad5000]

This is difficult to tell from the photos on a coin that has been circulating for 50+ years. It has had a long time circulating to be able to tell if it is actually the effect you see, or heat damage, or a localized spot of progressive indirect die transfer, or if that is from a good hit early on that has circulated and worn in a different fashion. This would have to be looked at with the coin in hand, and I don't think it could be determined from photos or even mag of the spot. Mag would probably make things worse here and really make it look like something it is not. I wish I could be more helpful on this, but this is a tough one from just photos.

[Cary Coins]

Thanks for all the replies.  The photos really can't do it justice as there is a significant area of bump on the reverse that doesn't appear well when photographed.  

[Henri Charriere]

On 3/7/2024 at 6:21 AM, Cary Coins said:

Thanks for all the replies.  The photos really can't do it justice as there is a significant area of bump on the reverse that doesn't appear well when photographed.  

If the field there is depressed, then one way to describe the phenomenon observed is an "inverted burial mound."

Note:  I hereby forfeit to NGC, and its subsidiaries, any claim I may have had as to intellectual property  rights to the term used.