I added another #8A to my collection that I am fairly certain is a plate 4, "D" relief, but I'm not sure of the plate position. The Neinken diagram for 78L4 shows plate marks in "S" and "T" that may match, but I'm not sure. The side marks and the blur in the "C" seem to be absent. If anyone can help me, I'd much appreciate it.
I've also been experimenting with microphotography, and this is the first stamp that I tried out my microscope setup. I know very little about either microscopy or photography, so the challenge has been great. I am really enjoying it, however, and I think that as I get into it, my plating ability will greatly improve. It's been frustrating to work with scans, because without good images, it's hard to get help from other experts.
The detail in the "S" and "T" of this stamp is shown as captured from a photograph vs. scanning at 2400 dpi. I've tried scanning at 4800 dpi, and even though the manufacturer states the optical resolution of the scanner (Canon LIDE 220) supports this, I actually find the scans to be of worse quality. Perhaps too much noise is introduced. At any rate, the detail obtained with a photograph compared to what I could obtain with the scanner blew me away.