Instead of trying to show off at their expense (or another collectors) and generalizing about the quality of their service, why not go politely inform NGC what you found. I'm sure you can find their contact info on the site. They might be responsive and appreciative for your help. Perhaps they are even aware of the error but yet to correct it online. But you could try to help them instead of start another of your threads here.
It seems like you got to make a choice, who you gonna believe? The professionals at one of the premier certification services? Or your own lying eyes?
For as much as it costs to have a coin graded, you would think that there would be a higher standard of quality control. Surely they would have someone employed to look at all the batches for the day and go "wait, that's not a nickel".
I've seen literally hundreds of slabbed coins that cost more than the process than the coin is worth. Heck you can buy all kinds of 2012-2014 normal circulating coins right now in pcgs or ngc slabs. One of them is the 2012 penny from Canada, tons of them slabbed, and they minted millions of em.
This is a case of buy the slab not the coin as I find the error slab far more interesting then a coin that's newer then the t shirt I got on
I do not understand collecting error slabs. Can someone explain this to me? I apologize. When a company makes a mistake, usually it is a bad sign, ie, low quality control, sloppy employees, etc. This isn't a mistake like our collective hobby enjoys from thesource, the mint, such as a mule, or a die crack. No no, this is a hobby SERVICES company making an error, and yet people pay PREMIUMS for these? If the valet at the coin show lost your car, would you save your ticket to throw on eBay in a year or two? No, I do not understand this.
I don't care about mislabeled coins either; however, I wouldn't condemn a TPG from making this kind of mistake either.
Because this worthless coin is now an oddity. I would not pay MUCH for it, but it suddenly becomes unique to me.