I just finished an article written by Rick Snow titled "Counterfeits that Will Scare You". He introduces the piece with a counterfeit AU58 1876
IHC, apparently good enough to fool PCGS
at least once. When Rick Snow resorts to describing
minute die details to differentiate between real and fake, you just know that most collectors will be
completely fooled, especially if "slabbed" as real.
The article continues to detail differences seen on a few semi-key fakes--some glaring,
others not. After reading this article, I can only conclude we are at the onset of a
big wave in counterfeit trafficking of rare coins, as well as deceptive bullion pieces. With scarcer IHCs, counterfeiting is certainly cost effective, especially where cheaper labor and tooling costs are available.
As one example, here are the diagnostics for one counterfeit 1869;
would you be able to tell? On this fake, even the Longacre Outlines on ONE CENT are present!

You're welcome to read this article yourself. I'd like to mail this journal out to collectors here--with the understanding that
you will pass it on to the next collector.

Everyone interested in IHCs should read the several articles in this issue.
In conclusion, here's what I take from this article.• I'll
never be good enough to tell a well-made fake
IHC from genuine, and the problem
will only get worse. An exception might be die varieties which are near-impossible to fake with today's manufacturing methods.
• I will not buy a semi-key or key
IHC online unless I'm
absolutely certain the source will stand unwavering by their coins. A legitimate looking slab will not cut it, even if the numbers match.
• Every raw, high-grade semi/key
IHC should first be assumed fake; don't buy unless you have the certainty of an expert who stands behind his appraisal. Only a few dealers are qualified to tell.
• As the problem will certainly get worse, collectors need to augment their own expertise as a line of defense against forgeries. Hopefully, the hobby will rise to this challenge and continue.