Looks outgassed to me. try a different glass. If you have new glass on hand, when the game is running, you can line up the pins on the new glass, touch them on the existing pins, if the new glass lights up at all, you know the glass needs to be changed.

These look outgassed.

I've always thought an outgassed display looked lighter in the digits. Almost like the gas was a wetting agent and kept the segments closer on color to the glass itself. Additionally outgassed segments tend to look soft around the sides.

Usually, you can tell by looking at the segments. if you notice some have a whitish color to them, and others are more black. that lets you know you have some kind of burn in going on there. Also, sometimes you will see little bubbles in the segments, this usually means those segments are toasted, or the whole display won't work.

What about if they look sparkly? I have some displays I am looking at and sometimes both left don't work and one them looks sparkly and the other looks fine.

Is it possible that the resistor on the left side for the voltage is not working properly and just a single side of displays doesn't work?

I am just now looking at all my displays and am following pinwiki sys11 displays.

only sparkly display I have is one that looks like someone dropped it and it shattered one of the inner layers of glass. Glass on the outside looks fine, but it looks like there is tons of glitter inside. Needless to say, they don't work.