You crossed out the NGC certification number but you can still scan the barcode. The NGC website states - Denomination?
Haha, I didn't think anyone would go to those lengths! It is an error on holder would be my guess. I was hoping to confuse a few more people. I have no idea how or why they put "40" where the denomination goes. I thought it was an interesting holder (probably one of a kind), so bought it.
You had me digging out old books! The good news is that I found my old Penny Whimsy while hunting it down.
I have seen them call a 5 cent piece a dime and print the incorrect date on a seated liberty half. I guess this is why they offer to replace miss-typed labels at no charge. I talked to a PCGS rep at one of the shows and he assures me that it doesn't cause the coin, which is graded properly, to increase in value because of a secretary's typing error. In fact, larger auction houses will insist on it being corrected before they will put it in an auction or catalog. Smaller auction houses will make note that it is incorrectly labeled. No one wants to get involved in misrepresentation. So you can keep it as is or sell it privately.
Well, in this case, it DID increase the value! Some people like oddities like this. The coin is the same (if I took it out, it would be worth the same), but the holder is unique to some (like me), who will pay a little extra for it.