King of Jordan's 540 K Cab A going up at Bonham's Paris sale, Feb 7.
It amazes me that most of the major auction houses refer to the dash on these cars as if it is made from real mother-of-pearl. In this case Bonham's says the car "retains its original inlaid mother-of-pearl detailing." Total bullsh!t. These cars never had real or inlaid mother-of-pearl. They are plastic just like what covers musical drum kits. That's why they discolor over time. Real mother-of-pearl does not grow into a single piece as large as the dash on these cars, and if it were inlaid it wouldn't look like this. Look at any photo of the dash of these cars -- that is clearly all one piece. Mother-of-pearl is made from the inner lining of different mollusk shells, and getting a flat piece larger than a very few inches is not possible. I discussed having a real mother-of-pearl dash made for a car, and the experts told me not to do it because it would not look good piecing dozens of slices together for something that large. It is primarily used for small, intricate detail on musical instruments, jewelry and fine furniture, not large flat things like a dashboard in a car.
So if you work for anyone who deals in these cars, tell them they did not come from the factory with mother-of-pearl. Sure, it's possible someone could make one, but I've never seen real mother-of-pearl on any 500 K or 540 K dash. If you have, I'm happy to be corrected and would like to see a photo of it.
As a humorous note, these large plastic sheets of faux mother-of-pearl are often used to make electric guitar pickguards ("scratch plates" outside the US). Because it is plastic made to look like mother-or-pearl, it is often referred to as mother-of-toilet-seat, or MOTS.