I just looked at the central cane again using my jewelers loupe & while I can not see a letter or any type of image because of the size of the cane, that cane does appear different than the other canes. All the other canes appear "full" where the center cane appears to have a "gap" between the "outside ring" & the "center post".
I know I am probably not using the correct terminology to describe the central cane, but hopefully you understand what I am trying to say.
Thank you again for all the assistance with this paperweight!!!!