1981 no mint 2018 penny

Hi,
Originally I was looking at two 2018s at one time to compare. But one is a D and other has no mint. The no mint I noticed some markings. Please advise. Thank you.

 

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Worn die issue.
Zinc cents are barely worth the time to look at. Comparing coins from different mints isn't particularly effective, either. Only will confuse you!

They call that the 'ridge line' around the lettering on the reverse (shield)
Surefire sign of a worn die

 

I’m past confused lol! Thank you!

 

Think of it like this:
Over time, as the die wears and more coins are struck, the metal flows outward from the center of the die. Eventually, you get the ridge line.
Heres a video of a hydraulic press (not like how coins are made but I think the ooint stands)
Note how the gunk crushed is pushed outward from the press. Same kind of concept with coins. If I don't make sense, let me know

 

When the metal has so where to go, it is pushed outward. The collar (that holds the blank in place) prevents the coin from being abnormally shaped. When the collar doesn't activate, the metal of the coin is pushed outward. Without a collar, coins would end up like this.

I hope I don't sound crazy.

 

Sound crazy? Heck, I been doing this fifty years and you taught me something!

 

Ohh you don't have to butter me up
thank you though!

 

Makes perfect sense. Thank you!

 

You're very welcome! Can't wait to see more.

 

Evan's the smartest 18 year old I know .

 

@dwhiz You need to watch the above video.

 

Yes he is.

 

hey, hey, hey.
Are you trying to scar him by showing the death of Thomas?

You both are too kind. Much love!

 

Of course when there's no mint mark they were minted in Philadelphia. The 2017 is the only cent with a P mint mark and that's for some dumb reason that escapes me. I think they were commemorating the opening of the Philadelphia Mint or some such thing. Why do it in 2017? That's for them to know, I guess, and us to try to figure out...

 

225 year anniversary of the opening if I am correct.

 

There's a real commemorative number for them, 225. Lol, who picked that?

 

As Eddie pointed out, no mint mark generally means the coin was minted in Philadelphia as it being the main mint, they didn't think it necessary to identify themselves. So, in the future you can just say it is a 2018 P. LOL

 

a horses behind? Just joking of course.

 

What about the 230th anniversary of the USMC?

 

Lol