Its an excellent steampunk project from johngineer, both in sight and electronics. Its name is ChronodeVFD. Built around the Atmel ATMega88 AVR, it hosts the IVL2-7/5 VFD display tube and the Maxim DS3231 to keep track of the time.
The VFD is driven by the Maxim MAX6920 shift register. The power is delivered by a single AA Alkaline Battery. A MCP1640 boosts up to 5V for the chips. Eventually, a NCP1403 is used to further boost up to 13.5V for the VFD.
Here are some images from this wonderful make:
Follow this link to see the complete documentation.