I picked this up first because of the solo 4th bureau franking (one of my niches), but am also attracted to the philatelic history aspect. Can anyone here tell me whether it is Klein's handwriting docketing "Orangeburg coils" at right?
Yes, I knew in purchasing the cover that it was not paying an airmail rate, but I did not know that the etiquette is actually significantly later. Yay! I'll be soaking it off in that case. The cover's got plenty of philatelic history without the later nonsense.
Thanks for the nice bit of research, revcollector -- I'm inclined to agree with your negative conclusion. Probably a clerk working for Klein ... still might have Klein DNA on it somewhere (as well as Klemann) ...