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