1970-s penny

is this a RPM or MD it look's like the photo in ngc coin variety

 

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From my understanding usely when the MM and Date are Doubled it's MD, in your case imo it's MD.

 

+1 for MD.
Your coin looks to be MD due to the date and MM having the same amount and direction of shift/movement. And it really has no numismatic value with it's condition problems.

 

so if the date and mm have the same shift its md like this 2nd 1970-s

 

Yes Usually. MD is flat and shelf-like.
http://www.varietyvista.com/02b LC RPMs Vol 2/RPMs 1970S.htm

http://doubleddie.com/144822.html

 

The advice about the date and mint mark applies to coins up to about 1989, after that they had completed the process of putting the mint mark on the master die. After it could occur and still not be a DD, you just have to recognize it by other factors. The only coin I know with a DDO and a RPM is the 1960 sm/lg date D/D cent.

 

It's MD and that corrosion makes it worth one cent.

 

What causes the green corrosion on the coin?

 

Common Copper compounds color here
https://jeremyneo.com/copper-and-its-many-different-colours/

 

Hope this helps

Reed

 

Have you ever looked at a leak in a copper pipe? Same color. It's the copper.

 

...Air causing oxidation of the copper molecules at the surface of the copper coin.

Environmental damage, corrosion from chemical contamination, excessive heat...there’s a lot for copper to react to...Spark

 

Thanks. Amazing how easily we forget our basic chemistry

 

Great coin. Can i have it. Kidding. Thats a tuff one right

 

You got my best answer

 

I recognized them early and got a hoard