One of the suspected struck counterfeit varieties we are aware of is the 1797 “S-139” large cent from a 2015 TPG submission package. In our process of trying to identify these through images we go to the internet and search several sites for internet and auction example images to find any with the characteristic matching marks. In the case of this “variety” we had the lone submitted example only, and roughly a year passed until we found a matching one; the internet listing for this 2nd example was removed prior to a sale being made, and we lost track of it. But like a “bad penny”, these seem to raise their heads eventually and this missing one made its way through an internet buy/sell site showing it broken from a TPG slab; unfortunately a friend “won” it and sent images after the fact. I was of course disheartened when I quickly matched it to that example. That led to more discussion and investigation and through it we confirmed the match; it also matched many of the markers of the 1st example, but there are enough differences to be confident they are not the same “coin”, making at least one of the two a struck counterfeit… Continuing research leads to new/additional opportunities to gain more insight especially when higher resolution images become available. That is exactly what happened with this “variety”, and in comparison images additional attribution marks (we call them “sister marks”) just seem to pop out! And as the research continues if lucky an example is "discovered" that appears to be a candidate for the genuine "source coin", and the comparison's continue... The images for this post include the obverse and reverse comparisons between these examples; white circles and arrows point out common marks while the red indicate "uncommon"/ unique marks between examples. The last image compares the suspected source prior to the dies being made, and what it may have looked like after repairs in preparation for the dies; unfortunately these are the best images I have for the slabbed example listed by a notorious seller of fakes (and source coins) on the internet. It matches their MO for buying damaged genuine source examples and repairing them to make the dies to strike the clones... More to come; Best, Jack.