DCM chair  

If it's a recent chair by...
If it's a recent chair by Miller/Vitra then one would expect to find a label still.

is
Is that the only way? I know the old ones have DCM imprited under the seat.

your welcome
Haven't seen a fake DCM yet, but the fake LCWs look pretty bad.
http://

These are
These are the replicas. Have not seen one in person but not sure how you would determine it is not a real one with the exception of a sticker which could be copied.
http://sandiego.craigslist.org/csd/fud/2244753107.html

Okay
Boot glides, for one.
DCMs are not offered in White Oak.
Pictures can be difficult to discern. I suspect that if you were to see these in person, further differences would be apparent -- e.g. dimensions, shape of the wood, veneer, overall quality, etc.
I also suspect that these do not have a fake Herman Miller tag on them.
http://

Agree - firstly check the...
Agree - firstly check the feet glides, secondly check the construction - does it look the same as genuine chairs? Obviously dimensions is another. If you're still unsure then walk away.

Thanks
Thanks for the advice. Will stick to the vintage ones.