Seems to be the 500 driver, look at how big the 'black foam thing' is (dunno the correct name for it). … Compare it to the original 350,. the 350’s is significantly smaller.
Looks like you got a nice deal there, this deserves a new ep350 v2.0 user review... looking forward to that …

That's what I have too. Maybe I won't upgrade to the 500, after all!

---- A Woofer in Tweeter's Clothing... M60s, VP150, QS8s, EP350 Onkyo TX-SR702, Denon DVD-3910