457x «Confirmed • CHEAT SHEET»

: It is characterized by high-quality grey mirrors set against a contrasting ebony (black) lacquer finish.

In amateur and professional astronomy, refers to a high level of magnification (power) used in telescopes. : It is characterized by high-quality grey mirrors

I can provide more detail if you are: Restoring a Sparton radio and need technical specs. : It is characterized by high-quality grey mirrors