2009-D Penny Planchet Flaw Or Struck Through Retained?

It looks like a blown out plating blister. Is this a copper plated zinc cent?

Yokozuna: Yes, it's copper-plated zinc.
Coop: I'll see if I can lift the thing a little just to see the color. I'll let you know the results.

Well it is a struck through foil. Nice find. Leave the foil in place.

dang with that white smegma coming out of the crack in the center of the "O", I would have thought a plating issue.

I still think it could be a burst plating blister. It does have some areas that look like the zinc core is exposed around the edge of the flap, but I wouldn't chance damaging the coin to find out. It's an interesting find even if it's a plating issue!

And before anyone thinks I'm insane for asking if it was zinc...

The 2009 bicentennial Lincoln cents were minted in both a copper plated zinc version and in bronze (95% copper, 3% zinc, 2% tin,) but they were only sold in the Uncircualted Mint Sets. I have found a couple of original copper alloy 2009 cents in the wild and both happened to be the Birth in Kentucky design.

These were Satin Finish strikes, but they really didn't look any different from business strikes after they were degraded by circulation wear. There was a chance that QuarterHoarder72 had one of the copper coins that happened to slip into circulation. You could tell by the weight of 3.11 grams if it was the original alloy strike.

I have 10 sets from 2009 and I bought them because they contained the original copper alloy cents. The mint sold 784,614 2009 sets, so the mintage for each of the 8 coins would be a relatively low for the copper alloy cents in each design with a P and D mint mark. I thought this could make a difference in the coins future value, but it hasn't so far.

Here's the Philadelphia COA and special insert from one of the sets.







Edit: Took out a repetitious phrase.

Cool. Thanks for the info guys. So is this a burst plating bubble?