I'm no expert, but I'd venture that the designation is one coined by Jepp, probably, "computer, slide graphic, model 8A", whereas E6B is the government designation. Marketing.
From Wikipedia:
"The base name "E-6" was fairly arbitrary, as there were no standards for stock numbering at the time. For example, other USAAC computers of that time were the C-2, D-2, D-4, E-1 and G-1, and flight pants became E-1s as well. Most likely they chose "E" because Dalton's previously combined time and wind computer had been the E-1. The "B" simply meant it was the production model.
The designation "E-6B" was only officially used on the device itself for a couple of years. By 1943 the Army and Navy changed the marking to their joint standard, the AN-C-74 (Army/Navy Computer 74). A year or so later it was changed to AN-5835, and then to AN-5834 (1948). The USAF called later updates the MB-4 (1953) and the CPU-26 (1958), but navigators and most instruction manuals continued using the original E-6B name. Many just called it the "Dalton Dead Reckoning Computer", one of its original markings."
Here is the Jepp manual online:
http://www.flymilton.com/media/Jeppesen ... Manual.pdf
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