Nikkei Asian Review:

In an interview, Cook told Nikkei that Seiko Advance is the “reason” Apple was able to release its top-of-the-line iPhone 11 Pro in a new color called Midnight Green.

And:

Midnight Green is not the only color Seiko Advance provides for the iPhone 11 Pro — it is also behind the Gold, Space Gray and Silver models. “We are the sole supplier of colors for the iPhone 11 Pro and iPhone 11 Pro Max,” said Kabe.

But, in my mind, Midnight Green is notable, noticeable, an evolution in metal iPhone colors.

Interesting article. Turns out, Seiko Advance has been an Apple partner since 2011. A relatively tiny company, doing an important job for Apple.