Coinbuf

That is awesome!! Congrats on a big milestone achievement in your collecting journey. I am also especially happy to see that you have nice high quality photos and descriptions for each, something that I think should be done and rewarded more.

Not for the coins you are discussing, damage cannot be reversed through any cleaning process. Wiping a coin with any type of cloth will only make things worse. For a professional who has experience using proper chemicals conserving a coin can stop whatever damage is/has been done to a coin, but again it cannot ever be reversed. It sounds like you have no experience with handling/conserving coins so you are more likely to do more damage than any possible good attempting to "improve" coins yourself, that is how many nice coins have been ruined over the years. Get yourself some 100% acetone, give the ASE's you have mishandled in the past a quick bath in the acetone, once dry place into the holder of your choice. That is the extent of any type of "cleaning" you should ever try yourself.

The only slabbed example I have, this coin design was never one that I was ever fond of

A classic G04 coin, @JKK nailed it on the grade. I see nothing in your photos to think the coin is off center, and to be worth any premium as an off center error some of the lettering would have to be missing.

The photos present a cleaned AU, not worth the money (to me) from a financial viewpoint, but many people have coins slabbed for reasons other than only financial reasons.

Welcome to the forum; to answer your question we would need to see clear in focus cropped photos of each coin, not group shots, and both sides. We have no way of knowing what or if any mintmarks your coins have, so your question cannot be answered with the incomplete information you have provided. Please read the pinned post at the top of this section titled "what you need to know about posting coins for inquiry".

It is very easy to tell that the coin is plated because the dings are just as shinny as the areas without any nicks or scrapes, and the zinc core of cents minted after 1982 is not shinny or reflective like this plated coin is.

At that time the mintmarks were hand punched on the dies, so you will see the placements in different spots. How many there are like this one depends on how long the die lasted in service and the number of coins it struck. While it might be possible to figure that out I doubt very much that anyone has ever tried to. Collectors and dealers have done the research to verify mintmark locations on the key/rare dates like the 1909-SVDB as a way to verify that a coin is real vs fake, but I'm very sure that nobody has done so for a common date like a 1951-S cent. As to your edit question on the date, the SF mint struck just over 136,000,000 cents in 1951. It is very understandable that over that many strikes there will be some variation in strike pressure and metal flow. Add in 70 years of circulation and it should not really be a surprise to see minor (and even sometimes significant) variations to any coin's design/lettering elements. As with any production facility the mint has a tolerance range for each coin type, and those tolerances can be bigger than you might expect.

As the fellas said just a damaged coin no errors.

You could also start a custom set, there is no restriction on how many coins of the same date/grade/whatever that you can place in a custom set.

Anyone know a good neck doctor!

Looks like the coin spent some time in the ground, as the fellas above said this is just a damaged Lincoln cent worth its face value of one cent.

What is a Yonex?

This is a real concern, before NGC began to allow PCGS coins back in registry sets I sent in a few high grade (67 or better a couple were already CAC'd) PCGS graded coins for crossover at same grade, all failed to cross. Now I was only out the grading/shipping fees as I said at grade, but it just goes to show that crossovers are dicey and never a sure thing.

Welcome to the forum, both sides of the coin exhibit some pitting, this could have been the result of being buried in the ground and would certainly be the reason for the details grade. As to the planchet, this was coined in the early days when the process of coining was just beginning so the quality of planchets and striking was much less perfect than today. There is nothing that you need to do, the coin is protected by the slab and will be fine just as it is, your task is to provide proper storage while you are the steward of this piece of history.

In that thread ATS another member linked the same stats from a few months earlier, the number of code 90 coins was much higher back in Mar of 2022.

At the stroke of midnight on the 25th of October 2525 just after a cat walks under a ladder.

It is PMD, there are a few ways for that to happen, a weak acid like pool acid can do that and recently Mr. Lange posted that long term emersion in a sonic jewelry cleaner can produce this same effect.

Your nickel is very nicked and banged up, so it is possible that what you see is just from the damage it has endured while in circulation. It is also possible that some of the missing details are due to a minor striking issue called a grease strike through as others have noted. While technically a strike through (be it grease or some foreign object) is a mint error, however, grease strike through's are very common and due to poor quality control. As such they are not coveted by collectors, and those that do like to collect them would rather find them via roll searching rather than pay for them. So there is no real market premium for them unless very dramatic; as someone else mentioned a good coin to keep for reference just not for any monetary value over the face value.

Welcome to the forum, your question is quite wide open and the answers might be somewhat varied. For myself I got started when my grandmother gave me a handful of circulated Indian head cents. I was amazed at the design and holding something that old wondering what it had been used for me was very intriguing. From that I took my admiration for the late president Lincoln and began my journey to complete a full set of Lincoln cents, that tied together my love of history and coins. Along the way I have put together other sets of beautiful designs like Mercury dimes, Morgan dollars, type sets of seated and bust designs, and others. I am a collector so I seldom sell, but when I do I have a few contacts to choose from and there are some solid auction firms like Great Collections to use also.

No just that it will take some searching and time to find one, I spent over a year looking for the 40-S Lincoln in 67+. I was willing to buy a PCGS graded one due to the low population of coins in that grade in NGC plastic, but my patience was rewarded as a few new coins were graded and I was able to acquire one of those new to the census coins. And of course you could always buy a PCGS/CAC coin and cross it to NGC, extra expenses that way but another possibility.

Finding one in NGC plastic will be tough as the census shows only 5 in 67+, so this crackouts there may really only be three or four.

I would not spend the money to have this graded/slabbed as I think it will grade as AU details. From your photos the coin looks to have environmental damage (pitting from corrosion) and I would not rule out the possibility of it having been cleaned at some time in the past. What do you think the coin grades and why are you considering sending to a TPG?

This part was a bit confusing to me as well, I do not understand the restrictions on the use of this new holder. The way I read it sounds like this holder may not be well suited to heavy coins, perhaps there is some concern about the coin moving around between the two layers which might be exacerbated by a large or heavy coin. It will be interesting to see how this new design works and is used.

NGC debuts a new holder called the airview I will say that this looks great, eliminates the prongs which many collectors really hate and gives the coin a super nice picture frame look. It does bring up some questions, how will it fair over time, will the "sandwich" materials hold up well or have issues with discoloration. I hope it is a hit with collectors.