Error 2004 ASE

Fascinating. Normally, I'd dismiss that as post-mint damage, but the marks are suspiciously spaced like reeds. How does the spacing of the marks compare, in size and location, to the existing reeds on the coin?

That last picture they don't line up to good. Real close though. Looks like the were gripped with something with small teeth. The grooves look to be deeper at one end and get shallower as it moves to the other end.

Welcome to the forum! That is a really cool error coin! What did you pay for it?

if I may guess;

I think the marks are on the same part of the circumference and they are as if this one got caught between the reeder wheel and another ASE, if that's the case, the other coin has a bigger error (or is sent to the melting pot:)

This is what I think happened :

The coin negative1 has is the one standing vertical (we can see that one as a rectangular) and the other coin that already has the reeds can be seen as a full circle.
When the reed-making wheels (or whatever they're called) try to turn, the vertical coin gets these marks.

That of course would be true assuming that a reeded ASE is hard enough to work as the counterpart. That could be the reason why the marks on both sides aren't identical.

Of course this is all my theory, probably there are countless cogs and stuff at the mint that could make those marks.

Great theory, but that isn't how they put the reeding on an ASE. The reeding comes from the collar when the coin is struck.

No that just looks like someone squeezed the edge in a vise or some other tool with gripping jaws. Just post mint damage. In the first picture the small part sticking out past the circumferance of the coin in the bottom one or two marks proves that it had to have occurred after the coin was struck. At the time of strike when the dies are together nothing could extend out past the rim, and that mark does. So it had to happen after the strike.

The real question is, what kind of value does this coin have? I have never seen something like this.