IV-18 VFD nixie tube is a green fluorescent indicator that displays information in the form of numbers (0...9) and signs (dots) used in clock and other devices. High brightness
The IV-27 (ИВ-27 rus.) is a Soviet 13-digit (7-segment) vacuum fluorescent tube with a blue-green glow. Designed for clocks, instruments, and measuring devices. Manufacturer: Oryol Plant of Electronic Instruments (ORZEP), USSR. NOS.