Coinbuf

You asked about the N of IGWT on the obv, that is just a well placed hit from another coin or object, not an error. What you call tone I would call stained, that happened from someone that handled the coin with bare hands or the coin came into contact with some environmental contaminate, possibly even spend time partly buried in the soil. Our skin has oils which over time attack and stain coins, copper is especially reactive to environmental factors like skin oils and can become stained quite easily. This is why we always instruct new collectors to only hold a raw coin by the edge not the face of the coin. There are unfortunately many internet outlets like you tube or etsy where you will see many uninformed people that will hype coins like this as toned. If you like the way this looks there is nothing wrong with keeping it, but I have collected Lincoln cents for over 40 years and I feel very comfortable saying that the vast majority of Lincoln collectors would find this coin to be unattractive.

Just a well-placed hit from something after the coin left the mint, not an error.

Those metal drops or blobs are what we call die chips. This website has loads of information on coin errors and anomalies, this link will take you to the section on die chips. Link

My 7070 coin, rather dark and she was molested at some time in the past.

I cannot tell from your photos if the coin has a die crack (very common as mentioned) or if that might be missing a portion of the clad layer. The SBD dollar is made from a solid copper core with an outer clad layer comprised of a copper/nickel metal combination. If it is missing a portion of the clad layer, it could be worth the cost to have it certified as a mint error, if a die crack it is not worth the cost. You did the correct thing by contacting a local coin shop, just keep in mind that not every coin shop owner/operator is a great numismatist. Take a look at the site error-ref.com, search the site for missing clad layer and you can learn and see examples of real documented errors and compare to your coin. Welcome to the forum and to the world of coin collecting.

Happens when the die becomes filled with debris or grease and is unable to strike (or fully strike) up some areas of the coin. Very common and considered a minor error.

I'm not surprised, I expect that a few very well to do collectors are snapping up the Blay coins and price is no object to them. I'm watching a few and will bid strong but still expect to be blown out on those myself. You are better off finding a coin already in NGC plastic as that is what you prefer, far less expense and hassle than dealing with the problems of crossovers. During the time that NGC was not allowing PCGS coins into the US registry I attempted a few crossovers, not a single coin crossed, and half of that group had CAC green beans. There are a lot of politics and nonsense with the crossover game from both companies.

My first thought is blowtorch, but it has been blessed so there is that.

It is impossible to say much from your photos, heck I could not even tell what coin it is from the photo. However, if the coin has something active on it like PVC or verdigris, those can attack and damage the surface of a coin. My suggestion is to place the coin into a bowel of pure acetone (not nail polish remover), lightly agitate the coin in the acetone and see if the green gunk comes off. This is a safe method to see if the gunk can be removed without harming the coin, however, it is very possible that the surface of the coin may be pitted or damaged. If nothing happens then you may wish to look into the NGC conservation services if the coin is valuable enough to warrant the expense.

Welcome to the forum, did you check the accuracy of the scale? Have you done a specific gravity test?

It is pretty amazing how different a coin photo can look with different lighting and post processing, sweet coin for sure.

IT looks like it was squeezed with a tool or something, but a photo of the rim reeding in that area would be helpful.

Very often with the current single squeeze method the mint uses to make dies the doubling will only be in the center of the coin and not affect the outer lettering or designs. Having said that, I do not see anything that looks like a doubled ear on the op's coin.

No not with that coin, I have had some issues with NGC coins as the owner did not do his/her due diligence and remove the coin from a set or inventory once the coin was sold. But I do not recall ever having an issue with a PCGS coin. If the cert # checks out on the PCGS cert verification page then you will probably have to contact Ali to get some help. As I was typing one thought came to my mind, it may be that the sets are still frozen after the registry deadline, I'm not sure how long the sets are kept frozen after that date.

Ok, that makes more sense. Again a very nice upgrade you have in that 40P

Congrats on the new addition, I hope the bid you placed on the Red Copper Cents coin don't have you end up with a duplicate.

Congrats on those additions, the 57 Lincoln is very tough in 67RD.

Just plating bubbles.

Just as well, those black streaks would likely not be affected by conservation.

The coin may have been dipped lightly at some previous time but not harshly cleaned. I'm not a fan of the black streaks on the obv and the green stuff on the rev, but if you plan to crack it out anyway then a quick acetone dip would be in order.

I'll hold out hope for you that this is some off metal strike that is actually gold, but if I were betting, I would go with a platted dime.