Elephant Hide Eames Chair ? What is Original?  

probably new shock mounts
Hard to tell without closeups, but those don't appear to have the crackly oxidized surface that is typical of the 60-year-old neoprene mounts. In my experience, the original glue has a different (thicker) texture as well. I think these are replacements.
One clue would be to remove the legs and see if they've left strong impressions in the rubber. The old ones always show deep marks.

Are there two small...
Are there two small interlocking triangles behind the cross brace of the H-base?

My impression is that the mou...
My impression is that the mounts are original as there's some sign of deterioration. In the last pix, the 2 circles on the mount next to the screw suggest signs of the metal insert pulling away. That's my 2 cents.

Glue.
So the fact that there is glue residue does not necessarily meant that these are replacements? Would Herman Miller have done such a sloppy job with the glue?

Very unlikely
That does not look like the typical epoxy that Herman Miller used.

1956 base
(Herman miller definitely didn't do the re glue job! I am not sure what to think about the mounts themselves, they seem pretty new to me, but kin may be right also) edit: didn't see woody's post as I wrote this.
And yes of course it is a real Eames chair, and the zinc base has the rubber and metal swivel glides that were only produced one year (officially) 1956. The glides appear on many 1957 bases as well, and a few could also possibly have appeared before 1956.
The residue of the lost sticker is from a foil Herman Miller label. That and the paper patent number label (as well as the info the label provided) all point to a probable manufacture date anywhere from 1955-57.
Nice chair!

Possibly, but those are some...
Possibly, but those are some loooong drips, and from only two of the four mounts...
but usually the mounts on these only need replacement if they stay stuck to a base that is removed, right? And if this shell came off a tandem base (do tandem bases even go back that far?) or something you'd think it'd be a lot more beat, and it's not. I really doubt it's that kind of a marriage.
I agree that it would be of use to check the impressions under the tabs. If it's really tough to separate the base from the chair after removing the bolts then that may be another argument for originality.
Nice clean chair!

Thanks
Thanks for all the comments everyone. This is all very helpful info. I did not realize this was a medium height chair when I went to get it, and had to do a little research after I did. I'll go look at the chair again and see if I can get more information on the mounts by inspecting the impressions on them.

by "medium height"
Do you mean it is a low lounge height chair? Or are you saying it is the standard dining height chair? I would love to see a pic of the whole chair, from several feet away. That way it would be easy to tell if the base is low or standard.
By the way, the swivel glides can be on a dining OR lounge height base.
Just a thought.
edit: It MUST be dining height. Sorry.

Not dining height
It is Not dining height. Definitely not. Seat is 16" off the ground.
I referred to it as "medium height" as I was following what they say at the Eames Office website. From what I can tell, it's the same as one of the chairs on ther website, except it's an H base and not an X base.
http://eamesdesigns.com/catalog-entry/max-1954/
They refer to the 16" high chair as "medium."

Photos
I'll post more photos later when I'm back at my computer.

the Eames bases
are getting to be my main obsession lately.
That MAX base on the Eames site is awesome, but does yours kick back so much when viewed from the side? I notice also that the back legs of the MAX on the Eames site seem to be at a slightly different angle to the front legs, when viewed from the front. Maybe it is just that your photo was from a different angle, or possibly
it is the way the base evolved between 1954 (boot glide version) and whenever yours was produced, with the swivel glides.
It is possible that a MAX base with 1956 swivel glides is a very uncommon base, because MAX bases are not all that common to begin with. But it seems that there may not enough swivel-glides base freaks out there for it to matter.
But you never know. I am a base freak so-------
The plot thickens!

Legs
The back legs do indeed kick out in a similar fashion.

MAX
The legs on this base are certainly more splayed than the typical dining height H-base. I'm not sure if the MAX H-base was offered after this generation of glides.
I'll check out my spare H-bases and let you know what I come up with.