State quarter die grinder marks.

[Kriv24]

I have found around 30 2005 P Minnesota State quarters from mint rolls that have die grinder marks. You can see where they smoothed out some scratches and a crack. My question is, are these considered a mint error and does it increase the value any? These are uncirculated coins. I also have some that show the scratched or cracked areas before they used the grinder. Would it make them more valuable if they were sold in a before and after set? Thanks

[Kriv24]

Here is a photo of an obverse with die grinder marks around Liberty and Washington's face. Also behind the back top of his head is a second area. These coins would have been stamped right after the die was ground on as these marks should disappear after a short time stamping. So what do you think, error, variety or nothing special? Thanks

[Kriv24]

Here is a perfect example of die grinder marks. This is a Kansas state quarter with very apparent grinding. Look around Liberty and In God We Trust at these marks. These marks should disappear in around a hundred or so stampings. Shouldn't this be considered a type of mint error?

[onecent1909]

Here is a perfect example of die grinder marks.

This is strike through Grease mark. not grinding.

[onecent1909]

Here is a photo of an obverse with die grinder marks around Liberty

the pic is not the best but this also looks like strike through grease marks. they do not grind... they polish... sounds like a verbiage thing but grind sounds hard a polishing is not as hard.

[Kriv24]

I used to work in a metals factory. I know what I am looking at. I bet if you contacted the mint and asked if they use rotary tools like a Dremel to smooth out scratches and gouges in a die, the answer would undoubtedly be yes! Now if the missing "T" in trust is considered an error than coins showing the grinding done to cause the error should also be considered an error. It is a road map to the "rust" error. Wouldn't you agree?

[onecent1909]

the missing T is when the T is filled with a grease/goop like mixture. this is called a strike through grease ... it is an error... so re your other coins.... strike through grease errors..