Can Anyone Identify These Knob Inserts?

[Motron]

I have these discs, marked as being from "TV CITY" and appearing to be decorative inserts for a knob on a TV or other older electronics. Size is about 1 cm in diameter. I assume they are color TV related because of the red green blue pattern. I'm hoping someone on here will have the knowledge to at least narrow it down. Thanks for taking a look!