Is this really a Herman Miller ? I think not....  

Nope
Not H.M. but I've seen it before. If I remember who did it, I'll add that info.

The backrest
The backrest looks very similar, but the seat is a little too moulded to be Eames.
Looks like the back was upholstered at one point as well.

I think its a Chemold as in...
I think its a Chemold as in Koenig's first house. Maybe a Grossman design?

Looks like a Greta Magnusson...
Looks like a Greta Magnusson Grossman design for Glenn of California.

The incredible amount of interest
and bids on this chair would see to reinforce the fact that no one had been tricked.

Treadway had this chair March 2006
Quote:
"875. Chemold lounge chairs, possibly by Greta Grossman, pair, c.1951, molded fiberglass seats and backs attached to black rod frames via rubber shock mounts, each with Chemold paper label, 22?w x 24?d x 28?h, one back mount no longer attached, good condition 1200-1500"
http://www.treadwaygallery.com/ONLINECATALOGS/MARCH2006/0801-0900.html

Wait a sec......
The frame is slightly different, most notably on the backrest. Also the backrest is a different shape. I may be wrong.
Whatever, it's still ugly.

not Grossman...
This chair has been attributed to Grossman several times and many still try to claim that it is one of her designs, -naturally since her work brings high prices.
It has since then been cleared that it's not on of her designs, by the owners of the Grossman estate.
It is still widely accepted that the chair was made by a company named 'Chemold'.
What I know for a fact is that the chair is featured in Pierre Koenigs first house, which he built for himself during his student years.
I personally think it looks amazing, no matter who did it...

not Grossman...
and just like a common problem with Eames LCM's and LCW's when found in a similarly bad shape, -the bolts are not supposed to come through the back and seat like it does on this example...

Thanks for the info
These do pop up on eBay every now and then.

There are other variations. ...
There are other variations. Some have that kitchy but cool '50s patterns printed underneath the clear coat. Others have fabric coverings (theres one up now I think). While I think they're cool, I can also agree with Beloved that they're not that pretty.

I kind of like them. Perhaps...
I kind of like them. Perhaps only because they remind me of that Pierre Koenig residence.

i'm [sort of] a fan
i especially like the leg system, though without some kind of cross bracing, it looks like lateral stability might be an issue.
the back frame also looks sort of clunky to me, not as expressive and graceful as the legs.
the back and seat look more than a little knock-offish, but the departure and experimentation with the base seems enough to effectively restrain my gag reflex.