AFAIK, all the E&S terminals and DEC peripherals
were vector based
until the PS/390. If this were a PS/390, then it would have the
characteristic black enclosure for the monitor, keyboard and tablet.
My PS/390 has an off-white monitor casing (and, IIRC, a white tablet). I
think the keyboard is a white base with a black bezel round the keys. I
have no reason to suspect that any of these parts are not original.
-tony