The native resolution on this would be 1600x1200. The 5:4 thing wouldn't be at play here, which might make it better. This makes me tempted to pull out my Dell P1914S and hook it up to a machine outputting 640x480.
As to whether it has 13W3, my guess is probably not. This would have launched in the mid 2000s years after Sun had finally ditched 13w3 in favor of regular VGA (and, more realistically) DVI ports on everything they built.
This is, as far as I know, a straight badge job on an NEC-built monitor. Aside from perhaps having some stuff to support NEC's previous computer platforms it probably doesn't have anything really special in it compared to, say, a Dell UltraSharp or whatever HP called their similar series of monitors.
If 1600x1200 is just generally better for scaling then that would be nice and it makes this genre of monitors (there's lots of them that exist) recommendable for anybody who wants to use them this way. They're good displays.
However, they area also very well liked by, well, everybody else. Lots of the 20-inch 1600x1200 displays support additional refresh rate options (for the NEC computers as well as, say, Amiga and IIgs), and Dell's in particular also have component and svideo+composite inputs, making them popular among certain types of game people. And, people with midrange productivity needs also like them on alleged moral high grounds compared with 1920x1200 displays, and probably more importantly, 1920x1080 displays. (On a modern computer, a rotated 20-inch display at 1200x1600 would make a really good proportion for a vertical monitor for, say, full page word processing or just whatever. I run two 1200x1920 displays at work like that, but for tickets.)
Anyway, definitely a great find and this genre of display is worth grabbing if you can find them. I don't know if it's worth rejecting 17-19-inch 5:4 displays in favor of these on the promise it might look better, though.
