Sony Vaio VGN-N350E question

I have a Sony Vaio VGN-N350E notebook. However, I cannot find for the life of me whether it's a 350E/B, 350E/T or 350E/W model. The Sony website, even after ''inspecting'' my machine, only tells me what I know... that it's a 350E - it's not model specific.

I've Googled this question, and can't seem to find an answer. Figured I'd ask in FixYa land to see if anyone knows.

FYI, I can't determine by factory specs, as the laptop was upgraded by the original seller.

Thanks in advance :)