YouTube User Dercebe uploaded an amazing video of an all tube nixie clock. I've posted a comment asking for more information. In the meantime, this is his description:
All tube Nixie Tube clock. Still without case. Featuring all tube electronics, no semiconductors apart from 1N4007s, mainly in the BCD decoder circuit. Timebase derived from line frequency. Neon indicators show state of the flip-flops, making it a dual binary/dec clock. Flip-flops and active parts in the decoder are E92CC Telefunken tubes NOS. Display Tubes are russian IN18 in custom designed sockets. Timebase frequency scaler using E1T beam deflection tubes. PSU offering 3 tube stabilized outputs. Direct setting via BCD logic switches. Aprox. 1500 components, over 4000 solder joints, ca400 Watts of power consumption.