1969-S Nickel Error? Need Help Identifying

Thank you!

That is what I'm saying, it is after the lowest part of the die stroke when the die separates, it makes the mark on the coin. (I prefer damage, because to me that area is altered)

However, there should be a cutoff somewhere. I've seen MD explained as either Machine Damage or Machine Doubling. I prefer the latter. I think that any part of the strike that causes abnormalities should be considered errors (including what happens beyond the full downstroke). While in complete control of the mint under normally operating mint conditions, it happened and doesn't represent what it is intended to look like.

Even Die Deterioration (and previously, mintmark punch deterioration/damage) can be included because it is something that the mint is in control of and decided to be lax about. How is Die Deterioration different from die cracks, chips, Cuds, etc.? It's all wear/deterioration/overuse.

The only common thing in this area I wouldn't include is bag marks because they are indistinguishable from marks that came post-mint possession.

But, it doesn't mean much beyond trying to clarify a term because this doubling/damage is not sought after and some types of damage/errors occur a lot more frequently than others. I guess that's the real test: Rarity.