Alexa was looking to dress up her dad’s 1951 bathroom, and I suggested she play up the black trim with a fancy black toilet seat. Well, here it is – the Black Pearlescent Kathyrn toilet seat from Kohler. Be sure to get the nickel hinges (chrome is also fine if that’s available.) The one caveat is that it is for elongated toilets only. If you have a round-front, all that I can find so far is plastic (not even wood). I’ll keep searching on that front.
One other thing – this is expensive, the list is around $250 as I recall, although you can find it cheaper online.
Also – it’s available in White Pearlescent. I have to say, if I had an elongated toilet, I would definitely get this, it is wonderful. And – I have seen precedent for it in vintage advertising.