We have covered plenty of cool Nixie wristwatches here in the past. Many of them have only two bulbs though. The Titanium Nixie Tube Wristwatch has 4 tubes (IV-9). It can serve as an alarm clock but can display battery juice too. The watch measures 60mm in diameter.
This Nixie wristwatch runs over 20 days on battery. MagenKening is selling this on Etsy.