There are projection-type digit displays. I can't seem to find a picture at the moment, but these had an array of incandescent bulbs which project the image of the digit onto an internal screen. The timeline seems about right, this was peak Apollo era tech.

There's also nixie and numitron tubes, as well as some neon digit displays. If it wasn't a tube, maybe it was a nixie-like display with a stack of acrylic plates each illuminated by an individual bulb.