Lower left LED display board for Stern STAR TREK pinball machines.
LED lamp board reference:
520-6813-00 LED lamp PCB 3 bank targets
520-6808-01 LED lamp PCB 2 position
520-6808-00 LED lamp PCB hex inserts
520-6808-02 LED lamp PCB 8 position strip
520-6811-00 LED lamp PCB lower left
520-6812-01 LED lamp PCB lower right
520-6812-00 LED lamp PCB upper center
520-5333-00 LED lamp PCB tri color