Very heavy and a unique item. It came from a 1950's Aircraft test facility where a wind tunnel was located, for evaluating the aerodynamic properties of aircraft under test.
This was taken from the control room and was used to indicate the position of the slats that directed the airflow inside the tunnel. Conversion into a clock is very easy, just replacing the 4 numerical indicators for Nixie tubes, this one could do time and temperature as it has 2 displays.
33 x 28 x 25 cm