What Pat said
I was going to say the same thing.
The picture is reversed, but besides that, someone had a picture I'd say last Fall (?) of the matching or very similar washer which looked as if the top portion involving the full-width light of a '66 Lady K control panel top had been lobbed off in a fencing match, leaving only the light over the dial.
If I recall not many of us, if any, had ever seen that model before. With a little Searcholating, I'm sure we can find the original thread.
Gordon