Quite remarkable re-use of the old CRT tubes from oscilloscopes to emulate a clock!
The second gen:
The fourth generation is up on kickstarter:
https://www.kickstarter.com/projects/1474770115/the-oscilloscope-clock-iv-analog-version-for-large
The second gen:
The fourth generation is up on kickstarter:
https://www.kickstarter.com/projects/1474770115/the-oscilloscope-clock-iv-analog-version-for-large