Can anyone authenticate these DKR-2 chairs.  

Hmm
The condition of these chairs is curious. I have never seen vintage bases that shiny or without some kind of tarnish. I have a zinc Eiffel base at home which I believe may be made by Modernica (but not certain since I have never seen a definite one in person to compare). On the base that I have, I know the black spacers on the glides are plastic instead of rubber. The main rods are thicker than Herman Miller. I will take a closer look tonight.
The very early wire shells did not have weld reinforcements on the sides where the shell bends. However, I'm not sure when the reinforcements were added. Eames Office shows a 1952 example that looks like it does have the reinforcements.

Suspicious
Modernica Bases - almost guaranteed. WAY too shiny to be vintage, and Modernica supplies you with the locking washers you can see in the underside pics.
Also - one of the chairs is effed up along the top. In the pictures of the chairs without the bikinis you'll notice one chair has a graceful arch where the other has a dent in the wire.

Interesting
The dented chair seems not to be dented but the bow seems to be part of the design as the paint is fine, no dents or dings or broken wire that would be apparent if it were bent. Hmmm? The bikini pads also seem very vintage.
Thanks for the insight. Keep it coming. Opinions? Like or contrary?

Okay
I am looking at the base I have now.
As I mentioned, the main rods are beefy. Even thicker than the Vitra re-issue, which I believe are slightly thicker than the original Herman Miller.
The ends where the glides are attached are not perfectly squared off like the ones in the listing. They are slightly rounded. However, Modernica has been known to change their base design (e.g. low rod base, for sure). Squared-off end is easier to fabricate. Under the cap nut there is a small black spacer which is also plastic. This appears to be the case with the ones in the listing as well. I haven't seen the original Herman Miller glides so I don't know if both spacers were used or just the larger one.
For grins, I just broke out the micrometer:
Reproduction base: ~9.8 mm diameter
Vitra re-issue base: ~8.8 mm
Herman Miller base: ~7.8 mm
So I was right... 🙂

Second production bases?
Didn't second production bases have the metal glides.
Also - what diameter are your referring to in your measurements?

Diameter of the main rods of the base
Yes, these are first generation style glides.
Second generation glides were the push-on type with rubber sleeve/boot and metal foot.

Modernica
to be sure.

I appreciate it...
If you weigh in, please take the time to state why you think the bases were made by one manufacturer over another. Thanks.
PS Anyone want to take a stab at value?
PSS The estate company claimed these chairs had been in the home for many many years. The pads show serious. The other midcentury furnishings were immaculate. Modernica hasn't been around that long. Are you all sure these can't be originals?

i'm going
to play devil's advocate..
if you check out the high resolution images for this wright listing, not sure if you can definitively say the earlier dkr's *didn't* have squared off feet mounts.. they don't look exactly square, but they don't look to be rounded either..
however, the condition of the eBay chairs look to be unmatched...
http://wright20.com/auctions/view_search/GD2E/GD2G/122/LA/dkr/G20I

Thanks for that link
Yes, the leg ends do look to be squared off in those pics. But the ends are also much smaller than the ones in the listing. The ones in the listing are fat!
You can also get a sense of the delicacy of the bases (i.e. thinner rods).

Value
If the shells and bases are Modernica, then 50% of Modernica's retail price might be fair.

Okay
Looking at the Wright link, I'm fairly certain it's not very plausible for the eBay chairs to be vintage. Look at the matte finish on the Wright bases vs. the glossy finish of the eBay ones.
Also look at the way the Wright cushions are indented. I know the eBay listing says the chairs weren't very much used, but I'm really suspicious of this listing. Just too many questions about it for comfort.

And the shells?
Any thoughts on the age and manufacturer of the shells? Do these look like Herman Miller?

Hey friend,
These are fakes.
100% fakes.
100% Modernica fakes.
The one on the left is newer Modernica.
The one on the right (with the little bump) is Modernica circa 2002-2004, see photo below.
F-A-K-E-S
Pass on these, it's not as if there wont be hundreds more opportunities for Eames Wire Chairs on eBay in the future.