I almost bought it on a whim, but there was only 1. From what I could gather from a bit of websearching, it's a numerical indicator that uses a bunch of dots to create the characters. I would be very surprised if it was an actual array of individual bulbs or LEDs; the illustration I saw would suggest at least 20x20 dot pattern and that wasn't possible with LEDs in 1969 (based on the date code I saw in the ebay photo).
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