Nixie Tube Clock:
Nixie Tube Clock: IN-14
I have been fascinated by high voltage discharge display tubes since I first saw a Nixie tube back in 2000. These types of tubes were used as numeric displays back in the 1960s, and now are available in surplus. Unfortunately, they've become more scarce as the years have gone by. I designed and fabricated a number of clock designs from 2010 to the present, and continue to refine clock designs based on various tube types.
One such clock is based on a popular Nixie tube, the IN-14. Note that this type of tube uses the same digit for 2 and 5, rotated 180 degrees: