The cockpit of the Douglas X-3 Stiletto has a rather weird looking airspeed indicator. (The leftmost instrument in the top row.) Two concentric circular scales, the outer one goes from 0 to 20, the inner from 20 to 44. What do the scales show?
The actual max airspeed of the single X-3 aircraft built was about 615 knots or Mach 1.0. The initially planned max airspeed was about Mach 2 but that was unobtainable as the intended engines did not become available and lower thrust ones had to be used instead.
Could it simply be that the scales are KIAS * 10, and as the aircraft starts moving, first the needle for the outer scale goes up to 20 and then the inner needle starts moving from 20 up to 44, i.e. 440 knots? (But that is much less than the actual max airspeed.)