Left is EIN030. No9 /5 Has only annealing fracture left of embossing that you'll only notice if light catches just right. You can see in my single pic.

Right is EIN020. Only one small opened bubble under base straight down from O of No in my pic.

Both insulators are blue in color.

Take the pair for $30 shipped anywhere in lower 48 US States. I accept Pay Pal non-fee payments as well as checks. First Email.