[garcsa]

Bought these on local "ebay". Everybody knows the details : shiny - matt plastic, lenght of the cable, hard case , logos colour  etc. Signs are OK. One friend of mine said :   -Forget the outher marks, the real ones have white drivers!
(  http://www.head-fi.org/t/400031/px100-disassembled )
 
 Ok , I need to clear them anyway...
 
Black driver..

 

 
And now please take a look on the dome part of the membrane!

 

[brunk]

Seeing the Sennheiser "S" logo on the PCB tells me its legit, but you never know just how far these fakes can go.

I also wouldn't take your friend's word as gold either, unless he has actually called Sennheiser to verify his statement.

 

[Zombie_X]

Hi,
 
Before we call these fake you have to understand that this can be a revision. Sennheiser does this and it could be a different version of the driver.
 
Also how do they sound to you? The PX100 has a bass heavy signature with full mids and smooth treble.

 

[Nagasaki_Kid]

I had one with black plastic and newer ones with "white" clear plastic. I believe the black plastic ones are the older revision before they switched to ccaw voice coils. They have a bit less treble and more smoother presentation(from memory(I went through the copper then the ccaw version and currently on px100II)).
 
 
Personally I prefered the copper voice coil version to the ccaw but that could be because I was use to the sound sig before switching up

 

[sidel]

I'd say it's more likely a revision. If it isn't then that's some incredible attention to detail on part of the faker. it has the sennheiser logo on the PCB and what I think is "sennheiser" across the diaphragm.

 

[garcsa]

The sound is as Zombie_X described.  Personally like the warm, dark, smooth sound signature. Now, I also think it's the older version with black driver. Too much "original marks" to be fake. Also the sound is ok. Thanks guys!