MD. Very common on the edges of the Memorial building.
I'm with Jay. All I see is deterioration. It's definitely not 001 because the mint mark location is not correct.
It looks like glue or some other substance has dried to the surface of the coin. I bet a dip in acetone would take it off.
It looks like it might be a rarer form of die deterioration that produces incuse doubling....
Sure is. That's a nice one.
Meteor strike?
Yeah, it's not uncommon at all, especially with late 60s/early 70s cents.
MD unfortunately.
Environmental damage.
It's a grease filled die. You might get a few buck for it.
It's MD. It takes away from the letters rather than adding to them and is also flat, and shelf-like.
Welcome! Before 1990, mint marks were punched into each die by hand. Due to this, you'll see a lot of variation in mint mark position. This is...
It's a lamination error. Very common on the war nickels.
An easy way to tell if it's a plating bubble is to poke it with a toothepick and see if it collapses.
That's Jason Cuvelier's page. He also has an excellent website- http://www.errorvariety.com/OFD/index.html
Yes, that's plating bubbles.
Yes, that's a small date.
What you are seeing is die deterioration. Same thing as the 1955 "Poor man's double die" even though it's not really a doubled die at all.
The last coin shown on Wexler's 1972 page is the doubled master die. http://www.doubleddie.com/384301.html
This is the master die doubling that you'll see on about 60% of 1972 cents from all mints.
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