Like the NSP1 and NSP2 this exhibit is a strobe tube. Regular pulses of light synchronised to the speed of a rotating object has the visual effect of making the object appear to be stationary.
We could find no data for this particular tube.
Unlike the other Strobotrons this has the anode connected to a top cap.
The cathode and trigger electrode.
The wide glass tube envelope is 28 mm in diameter and, excluding the UX4 base pins, is 96 mm tall.
Updated June 17, 2020.