Just Bob

I would just add that if you plan to stick with the hobby, I would strongly recommend buying a copy of A Guide Book of United States Coins (also called the Redbook).  You'll be able to figure out which coins are common vs rare.  You'll also get mintages, mint mark locations, a basic grading guide, weights, compositions, dimensions, and some history.  All at your fingertips without having to sort through all kinds of web sites.
I would bet that nearly every experienced collector on this board who started by collecting US coins had one and used it frequently.  It's the best $15 you'll ever spend on the hobby

I plug my phone directly into my laptop to transfer pictures. It seems to work well.
And here is a link to the Numista page on your coin, in case you haven't checked it out over there. (Sorry, no picture of a proof.)
https://en.numista.com/catalogue/pieces2725.html

No need for anyone else to elaborate. You answered it well enough.

No need for anyone else to elaborate. You answered it well enough.

Cracked out of an ANACS details holder years ago, and carried for several years as a pocket piece.
 

Congratulations on scoring the elusive '21-S in such nice condition! And a big "WELL DONE" on completing your set! 

I was going to write something along these lines, but you did a much better job than I would have, and went into much more detail. So, I will just say, "Yeah - what he said."  

This is the first time I've ever seen any of these. Love the rainbow toning on the German side.
Leave it to you to come up with something this unusual. 

Welcome to the forum. 
Let's narrow this down:
The 1818 cent was the "Matron Head" design. Since this is a Braided Hair cent, it had to have been made between 1839-1857. (It is most definitely not one of the rare proof re-strikes from 1868) Further, the obverse was modified in 1843 by changing and repositioning Miss Liberty's head slightly. You don't show the reverse, but it was also modified that year. All that being said, the most likely explanation is that it is a cent from 1848, which was damaged, either intentionally or accidently, which made the "4" look like a "1".
 
While I was typing, the reverse picture was posted. It is the later, "Large Letters" version, used after 1842. "A modified 1848" seems to be the answer.

Congratulations on scoring the elusive '21-S in such nice condition! And a big "WELL DONE" on completing your set! 

You do realize that our esteemed hosts also have a Variety Plus section that gives information about coins like this, right? 
(Picture below courtesy of NGC)
 
Here is a link to the Roosevelt dime varieties:
https://www.ngccoin.com/variety-plus/united-states/dimes/roosevelt-dimes-1946-date/
 
 

Picked this one up a few days ago. Just liked that it was a knockoff of a 8R C&R.

Yep

S-224 looks right, and I like this one as a VF. Not all beat up or corroded like many large cents, I really like the color, and, the granularity doesn't bother me a bit. Nice coin!

C'est Francaise 

C'est Francaise 

That head type was discontinued after 1835. If you're seeing what looks like 1838 it's probably 1833.

Welcome to the forum. 
Let's narrow this down:
The 1818 cent was the "Matron Head" design. Since this is a Braided Hair cent, it had to have been made between 1839-1857. (It is most definitely not one of the rare proof re-strikes from 1868) Further, the obverse was modified in 1843 by changing and repositioning Miss Liberty's head slightly. You don't show the reverse, but it was also modified that year. All that being said, the most likely explanation is that it is a cent from 1848, which was damaged, either intentionally or accidently, which made the "4" look like a "1".
 
While I was typing, the reverse picture was posted. It is the later, "Large Letters" version, used after 1842. "A modified 1848" seems to be the answer.

I am about to look really smart or really dumb, but I am going out on a limb and say that is a 1952 Lincoln.

This particular "other" does not think it is a repunched mint mark. Judging by the (very good) photos, I see no shadow around the areas indicated. What appears to be a shadow around the spot to the left of the lower serif, looks like discoloration, to me. No shadow means that the areas are not raised. So, my opinion is that the areas are something in or on the surface of the coin - maybe a stain.

Welcome to the forum. 
Let's narrow this down:
The 1818 cent was the "Matron Head" design. Since this is a Braided Hair cent, it had to have been made between 1839-1857. (It is most definitely not one of the rare proof re-strikes from 1868) Further, the obverse was modified in 1843 by changing and repositioning Miss Liberty's head slightly. You don't show the reverse, but it was also modified that year. All that being said, the most likely explanation is that it is a cent from 1848, which was damaged, either intentionally or accidently, which made the "4" look like a "1".
 
While I was typing, the reverse picture was posted. It is the later, "Large Letters" version, used after 1842. "A modified 1848" seems to be the answer.

Welcome to the forum. 
Let's narrow this down:
The 1818 cent was the "Matron Head" design. Since this is a Braided Hair cent, it had to have been made between 1839-1857. (It is most definitely not one of the rare proof re-strikes from 1868) Further, the obverse was modified in 1843 by changing and repositioning Miss Liberty's head slightly. You don't show the reverse, but it was also modified that year. All that being said, the most likely explanation is that it is a cent from 1848, which was damaged, either intentionally or accidently, which made the "4" look like a "1".
 
While I was typing, the reverse picture was posted. It is the later, "Large Letters" version, used after 1842. "A modified 1848" seems to be the answer.

This particular "other" does not think it is a repunched mint mark. Judging by the (very good) photos, I see no shadow around the areas indicated. What appears to be a shadow around the spot to the left of the lower serif, looks like discoloration, to me. No shadow means that the areas are not raised. So, my opinion is that the areas are something in or on the surface of the coin - maybe a stain.

This particular "other" does not think it is a repunched mint mark. Judging by the (very good) photos, I see no shadow around the areas indicated. What appears to be a shadow around the spot to the left of the lower serif, looks like discoloration, to me. No shadow means that the areas are not raised. So, my opinion is that the areas are something in or on the surface of the coin - maybe a stain.