How to tell Fake from Real  

If you remove the cushions...
If you remove the cushions and take a picture of the cushion backs as well as the clips that hold the cushions to the shells, a lot of people on here will imediately be able to identify it as a knock off or not.
My first reaction to the photos is that the armrests look wrong, the shells look too thick and are not rounded off on the edge.

These old threads are a hoot!
These old threads are a hoot!

A few images more
Hi everybody and thank you for the replies. Obviously this 4 year old thread brought back memories for some people. I'll add a few more images to see if we can shed some light on the origin.
I haven't bought the chair yet and these are the seller's photos. Just trying to make up my mind.

It's weird-
The leather looks much newer than the wood and yes,the armrests are way too thick.I must say,the shells look kinda correct to me.

Looks like a recent production in dark cherry to me...
But I wouldn't take my word for it.
You're welcome.
I guess.

Yes,I agree
Cherry indeed,but it makes you wonder how a base gets separated?

Full Circle
Wow... hard to imagine that was me writing the initial post way back when.
As to the new chair in question, absolutely fake. A local knock-off store has this copy. At a glance it is a decent copy in terms of most details, but the proportions are wrong, the leather is wrong, and the woodgrain is wrong. And my guess would be the base is gone because that's the biggest give-a-way on this copy.
The wood is not actually cherry - it is ash with a cherry stain. Cherry tends to much tighter grain, with very little texture. And the new production HermanMiller/Vitra chairs are almost glass smooth, with no physical wood texture.
Armrests are way too thick, and the photo of the screws shows them at the wrong angle - going perpendicular into the underside of the pads, vs at a diagonal on the authentic chairs.
And almost missed it in the photos, but if you look closely there is a metal brace tucked under the armrests holding the back shell to the base.
The chair below shows the same coarse grained wood, the same thick armrests, and the faux base - and you can see why it's missing...

Stay away.
It's fake. And not cherry. Maybe ash with a cherry colored stain.
*edit* sorry LuciferSum, I should read what others say before injecting my (redundant) opinion.

Fake it is then...
I didn't get the photos of the the screws.

Real ones
Feel like bags of sand.

Thank you!
Thank you all for your expertise. I will keep my distance on this one and save my money for the real thing.
I hope this helps others in determining Eames authenticity as well.

Material & Design = FEEL
hmmm....
Haven't posted much recently, but to those who know me, I don't buy retail or wholesale. This, of course, invites risk.
There are some good points in this thread. The reality is that you have to be smarter than the person you are buying from. They call it asymmetric information. But that is just fancy talk for knowing more than the other person.
That said, the difference between fake and authentic usually comes down to two things, Material and design.
Material:
When Arne designed a chair, he did not skimp on material. The solid aluminum base (will not rust, is not chrome so will not peel). The fact that you can "spin" in an egg chair at least 10 times without touching the ground. If there is wood, what type is it? Pine = crap in most instances. redwood? Cherry? walnut? Now we are talking.
FABRIC: An original will have the touch. All wool? good! All polyester? good luck.
That said, some materials chosen 50 years ago ended up not holding up to the test of time. Specifically with modern furniture and filling. Basically, if you find a chair that has a crusty, crispy filling, it "feels" cheap. It can also be an indicator of authenticity.
Design:
I laughed at the Ikea knock off of the LCW. That is ridiculous! Not even close.
Do you feel comfortable in it? Is the seat height right? Don't forget, designers were focused on conforming the chair to human form, not conforming the human to the chair. A big give away.
Patina/age:
Last but not least. An older wood will have a patina. Even the bent plywood. The fabric will show wear.
Last but not least....READ....the internet is crap. Everyone borrows from everyone else. There is this thing called a library. There are also pamphlets/literature.
I will now step off the box...sorry for the rant.
I will now step down....sorry for the rant.

IKEA?
LCW?

jef your chair is authentic
i can see a hint of a zipper hiding behind the leather piping. fakes would just staple the piping to the leather. i have had a fake and sat on the real one. i see no distinct difference, they're all comfortable. but if you have that tendency to recline to relax, go with a repro because the real one does not recline. what scares me nowadays are the fakes made in china, they have copied the original up to the minute detail, the only difference is the leather and cushion. just my 2 cents.

oops!
sorry jef it's a fake. didn't see the screws.