Chromexcel

Chromexcel is registered trademark for a kind of aniline leather with a history of production that goes back over a century in the US. The process of creating it requires "at least 89 separate processes taking 28 working days" at the Horween Leather Company.

Chromexcel was used in engine seals on tanks and other heavy equipment during World War II.

Variations of Chromexcel include Wooly, Beaufort, Cavalier, Plainsman, Huntsman, Kudu, and Horsefront.

...
Wikipedia