This is probably only cool to en error collector, but I've run into very few indents on the reverse side over the years.
When I started looking through some of my pictures, I realized errors on the reverse, at least for me, are in short supply. This is a 1968-D with one of the coolest "strike throughs" I ever seen. I have no idea what it is. The obverse is normal:
No, these are cut from a PCGS TrueView. I did sponsor a photo contest on the 1938 a few years ago. There were close to 30 different PCGS/NGC/CoinTalk members that participated. Even without having the advantage of shooting the coin raw, a few managed results very similar to the TrueView. Here is MessyDesk's winning photo.
Very cool. I contacted RMPSRPMS and am picking up a setup similar to yours. I look forward to getting familiar with it and hopefully being able to get some nice photos like the ones you make. What software do you use for focus stacking? I'm sure I'll have many questions for you once I get it all setup