No SureFire E-Series model has ever had double o-rings [on the TailCap-end of the body].
SureFire's webpage for the E1B
here does not state that it has double o-rings (unless I'm missing it somewhere)
Their more flashy page for the E1B
here does indeed show a photo of a segment of a double o-ringed body. It's not an E1B though. It's the wrong anodised colour, wrong dimensions. Possibly a photo of an M3 or perhaps an MH90.
The description does not mention double o-rings. The same image segment is also used for the other models featured on that flashy site.
The E1B doesn't need double o-rings anyway. They are only really required for divelights that could have the components rotated underwater.
One could argue that double o-rings stiffen up the ability to rotate the TailCap - useful in some situations I guess.
I'm sorry that SureFire's poor use of images (in the attempt to be helpful and show off the features of the flashlight) resulted in you having this expectation. Perhaps you'd like to contact SureFire and let them know how you feel?
Al