How Much Does A Problem Impact Coin Value

COINS ARE PROBLEMS......Needless to say, it just depends on the series, and what contamination is upon them...I am saying this to the 80 to 100 year old collector...as the ancients already know....MOST have been cleaned in some acceptable form or another to retain some sort of luster withing there grade, my meaning is a
G4 coins should NEVER look MS....such is cleaning...they have done for decades to try to match the wear with the luster to enhance the coin..
to the point that an "original coin" is discounted as it has been over toned(GEE? years of oxidation,could have it dulled it?)
Mean while others have there own lemon juice formula to keep the luster looking "just right" for an 1827 coin. or so
to make it look "MINT STATE"....They have all been cleaned............just depends on who you are when you submitt it...

I had a great example, and it wasn't even damage. I had an 1867 IHC. It was obviously uncirculated, no evidence of wear and good RB color. Most of UNITED was unreadable, as was the corresponding area on the reverse, IOW, a defective planchet.

If that error was on a common coin, it might be worth $5-10, but even a G4 would be worth many times that much. The customer (who was serious enough to tote around a stereo microscope) paid the full MS60 price, because he knew that coin just doesn't come in common date rolls.

I used to sell acid-dated buffalos for 1/3 of G price.

I saw an auction by a guy who specializes in them, and he got like 25% of F for one.

It all depends on what the buyers are looking for. I had a lady who would only buy them if the Indian smiled (somewhere around VG/F.)