I am not a member of EAC. I just believe that if you know what a coin should look like on all sides and why, you can protect yourself from many fakes and teach others how to spot them as well.
Several EAC members have been pivotal in rooting out counterfeits. Not only coppers but also silver coins, including two slabbed Gobrecht dollars.
I’m late to this; actually just created my account for this forum. On the “large cent” NGC actually posted an article on two they spotted there, both with the odd rim break on the reverse (same reverse, two entirely different dates): https://www.ngccoin.com/news/article/4923/Counterfeit-Detection-1840-1857-Large-Cents/ I own an example of 1857 and had it with others in a display at this year’s EAC convention.
Where did you get these from? If I had been looking for these on E-Bay I would have looked at the 1847 for sure to purchase. After a close up view I would have passed due to the lack of curl definition on the neck and below the bust. I would have passed on the 1804 for color and color alone. It looks like a dig coin. The half cent has too many detracting marks to list. Most likely I would have not seen that they were counterfeit. Thanks for posting.
The dates alone should have given those away. The fact that they were struck from the same reverse die further shows that the Chinese like to reuse their dies which have the same diagnostics.
Sorry I wasn't in earlier. But those coins gave me a "tingle" when I looked at them the first time. They just didn't look right for some reason. Helluva way to judge counterfeits, eh?
I don't seem to be able to get off of needing to be confirmed... Anyway, halfcent 1793 noted the 1836 Gobrechts and I hopefully have added the link to the Coin Week article: http://www.coinweek.com/counterfeit...836-gobrecht-dollar-1-page-attribution-guide/ We started with Early American Coppers and continued wherever the research took us.