Mine are (were, they just got stolen on holiday) the ones with the smaller tube at the end with black writing on it. They had milled metal housings and I checked the impedance - 17ohms exactly.
Apperance is almost a completely useless test of authenticity unless you scritinize them heavily.
Now I need to get some new phones. I don't want something that goes deep in the ear, but I want something with better, punchier and deeper bass than my modded EX90's.
They are fantastic if the low frequency end is uncluttered. But if you have music, like I do, with sub-bass + kick drums + bass guitar, they just can't cope. It turns to muddy, confused bass rapidly. Which is a shame because I love the fit and the fact that they rest just inside the canal, and that they don't isolate everything. Also, the mod closes the soundstage quite a bit. They're probably a bit too airy without the mod, but they sound very close post-mod, they don't breathe.
Maybe Denon C-700 would be good for me? Any suggestions welcome. I'm going to buy another D2 (yeah, stolen) and I don't use amps.