6 tubes Same Date set! IV-3 (a) are Soviet 7-segment VFD tubes, showing digits 0...9 and a decimal point to the right Phosphor color - green IV-3 (a) is equivalent to: DG-10A, LD-8051 The size of digits is 8 mm = 0.33 inch. Base: 12-wires Arabic numerals for vintage handmade clock or any DIY projects