1987-P Broadstruck Dime

I want to believe it's postmint - a light strike would not have sufficient force to "smear" the metal like that since the planchet is correctly sized and rather than move the metal would just show a weak image. Trouble is, how do you smear metal to that degree with no apparent damage to the other face?

I can think of no Mint process that would have this result.

 

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It looks like a gear rolled over that side, something like this spiral bevel type:

 

Think what y'all may. It came from the mint that way. The only thing y'all are seeing is United States of America and One Dime. Look at his photo again. I'll find the reference for y'all. I didn't just make this up out of the blue.

Definition: A stretch strike is an off-center strike with a very wide “slide zone”. Uniface strikes (coins struck against another planchet) often take the form of a stretch strike because the double thickness greatly increases effective striking pressure. Stretch strikes are rarer when only one planchet is involved.

A stretch strike that is die-struck on both faces owes its existence to an abnormally small minimum die clearance. Minimum die clearance refers to the minimum distance between the dies at their closest approach in the absence of a planchet. A stretch strike can also reflect elevated ram pressure, but this is hard to prove. Ram pressure is the tonnage delivered to a planchet of normal thickness. Elevated ram pressure without an accompanying reduction in minimum die clearance will not result in a stretch strike.

In addition to the wide slide zone, a stretch strike will also show exaggerated metal flow in peripheral design elements.

 

I do agree with gronnh20, this came from the mint this way. It clearly states that a stretch strike is an off center strike, I am gonna hold to Counterbrockage. NOTE: Counterbrockages can be in-collar, out-of-collar, centered, or off-center. They can be aligned with, or rotated relative to, the opposite, die-struck face. The degree of expansion and distortion depends on how many previous planchets were struck and whether one or both participants in the error were confined by the collar.
This is an early counterbrockage, note the design elements are moving off the rim. As Mr. Diamond says it was struck in collar

 

So how do you stretch strike something in-collar, with no place to move to?

 

The collar is larger that a planchet, when it is struck the metal flows outward to create the ribbing on the edge. It does not go far, but it travels very fast.

 

Contemplate where the concentration of metal is in a struck coin - in the center, where the devices are located and total area of increased relief is the highest. And the edge of the coin already has an upset rim to make metal available there. I suspect the net movement of metal in a struck coin is inward....

 

Send the coin in for grading to a top tier company, and see what they say it is, when it comes back.

 

if it was done outside the mint, wouldn't there be some kind of tool mark evidence or something to show it was tampered with?

 

One would think so; it's what is keeping me on the fence about this coin. The few nicks on the rim of the obverse to me don't seem sufficient to reflect the force it would take for a postmint accident to create the reverse.

Is it of normal diameter, and normally reeded?

 

yes, it is completely normal, nothing to show tampering

 

OK, that tells me it was normally-struck in a complete collar. It's the only way full reeding would be created. That strengthens the case for PMD.

This may be a Holmes-ian thing where we have to settle for the only conclusion that's left.

 

Obverse Capped Die struck onto a planchet/blank. Your coin was struck in the normal way, but it stuck to the obverse die, another planchet was fed into the press
on top or under said coin and press struck again causing the planchet to expand in contact with the reverse of said coin which inturn caused the already struck design to be splayed outward in a radial design.
I do believe your coin is a mint error, and a rare one at that! That is why it is so hard to define. I'm not saying I got it right, but just a possibilty.
30 years of machine maintenance gives me some insight.