not looking for an on-going argument ...
... but just read
"The Series E retained Nikon's superior seven-bladed diaphragms.
All Series E lenses are AI-s, and likewise fit every Nikon SLR camera, manual and auto focus. Some of the cheaper AF cameras and the D100 lose the ability to meter with the Series E as they do with all manual focus lenses.
.... The operation and compatibility of the Series E lenses is identical to the other manual focus AI-s lenses, which makes sense because they are AI-s.".........(c) Ken Rockwell
so I deduce the E was cheaper made, but did in fact have the Ai-S coating
certainly a maze of info if you dig into Nikon designations ..