Non_cents had the right answer. This is a form of die deterioration that the late Eric Von Klinger designated as a "ridge ring". It's common on...
My opinion remains unchanged. You may have spots of variable reflectivity (possibly due to "grease") but this falls far short of any surface film...
I see no evidence of surface film doubling, a surface film afterimage, or surface film transfer in the dime that leads off this thread. This link...
Superficial cracking with subsurface deformation is fairly common in dies. That's why you get bi-level die cracks and that's why there's no...
Just a die chip.
No retained cud here. Some intersecting die cracks primarily.
This is a lamination error, although I can't rule out the possibility that a detached flake was struck into the coin.
This is an uncentered broadstrike. The absence of reeding is a natural consequence of such an error.
I see what appear to be incuse (sunken), normally-oriented design elements, principally the top of Roosevelt's head. If this is the case, then...
The Memorial appears to have been damaged after the coin entered circulation. The best evidence of this comes from some of the columns, which are...
Here's an entry on intentional die abrasion: http://error-ref.com/thinning-and-loss-of-design-elements.html
There is accidental die abrasion and there is intentional die abrasion. If taken too far, the latter can be considered an error.
Except for a few recent exceptions, a letter that is smaller and thinner than normal is the result of intentional die abrasion, not a grease strike.
The design rim shows finning on the left. As far as doubling goes, all I see is die deterioration doubling.
An early stage as well. Nice.
This individual contacted me several days ago and I told him the coin was damaged. He's currently offering this specimen on eBay for $250...
As one other commentator has noted, this is a manifestatation of die deterioration.
This may well be an improperly annealed planchet. The term "sintering" is outmoded and inaccurate as there is no fusion of copper dust involved.
Although no overlay was presented, I do see what are most likely light clash marks on the 1976 quarter. Rascal is right that some clash marks can...
The letters "VOS" (from CENTAVOS) represent flattened, expanded first-strike elements. It's a typical effect.
Separate names with a comma.
