I don't recall how I eliminated 23 and 26 exactly, but I do know I looked up each of them on Heritage and read the descriptors (die lines etc) and was able to identify my coin did not have those lines etc. The problem is the dirt covers up some of the descriptors for the last two N numbers. I was hoping that there were additional markers that were not mentioned on the Heritage lots that would help determine. I have Newcomb's book, but it only goes to N-1 :( Any and all help is appreciated, even if that means telling me all the known markers for those two or pointing me in the direction where I can find them (online or hard copy books)
Here is another better picture of the reverse. Thank you!

Here is another better picture of the reverse. Thank you!


























