They're certainly not rare, seen a number of them over the years. Perhaps it was a reference to overall production number? When you consider that a lot of cities and towns had CD offices with communications centers and the Viking CDs were one of a handful of purpose-made sets, the numbers would seem to indicate just the opposite.
At least one New England state used a Johnson Viking Kilowatt at their station, and of course there was Hawaii with their KW-1 in the crater. This one apparently sat unused for years, and ended up as a prop for the original Hawaii Five-O series. I wonder if they ever put those big CD decals on the side of the cabinet?
