On doing a bit more research, I realize that this is not a DC5; it’s a C5, a year older than the DC5. Comparing the C5 and DC5 schematics, confirmed it. I was confused by the serial number which begins with "DC5…", but the escutcheon has "C5" engraved on it, which I would have noticed sooner if I’d been paying proper attention.
So, this would simply be known as a C5 Console (as opposed to the C5 Compact, which was a table model).