Actually, Black Witch is a seal-colored dog (a derivative of black), and she was the only one.
I didn't know what "seal" was, back in the day, but if you look at her photo you can see the red highlights in her coat, which is part of the seal coloration (derives from a combination of buckskin + chocolate/rednose).
If you click on Coca Cola's link again, I changed the 4th photo to show Coki on her first litter (which produced 4 pups: Stormbringer, Warlock, Tecate, and Black Witch)
Cheers,
Jack
PS: I never saw the color seal again, in any breeding I ever made, until I bred the chocolate Ouch! to the buckskin Missy and got Silverback![]()