The FX-6a is a 9-pin 8 mm xenon arc bulb. This tube is still clear indicating little use. The glass will darken with use. This tube came supplied with an FY-505 trigger module.
FX-6 series are called low cost strobes and are designed for observation of rotating machinery at up to 25,000 RPM. The maximum flash energy is 5 Joules with a maximum average power of 7 Watts. The maximum anode voltage is 1,000 V. These tubes can be fired at a maximum rate of 500 flashes per second corresponding to 30,000 RPM.
The EG&G name. The image is looking across the main electrodes with the trigger wires on both left and right.
The construction with the 'Sparkers' between the main electrodes.
The thin glass tube envelope is 20 mm in diameter and, excluding the base wires, is 70 mm tall.