Yellowstone is a vegetable-tanned leather with a coarse, shrunken grain and color that shifts between the tips and the valleys.
From Horween in Chicago. No two straps have quite the same grain, and it's especially at home on a vintage watch.
Yellowstone has a coarse, shrunken grain, and it's the loudest surface we cut a strap from. Color settles unevenly across the tips and the valleys, so the leather reads light and dark as well as high and low. That unevenness is the point of the hide and not a flaw in it. The raised tips meet the world first and burnish to a soft shine, so the pattern grows more pronounced with the years instead of wearing flat.
Black Yellowstone is what a plain dial wants when the case is doing nothing interesting. Tan is warm and golden, and the shading between tips and valleys shows hardest on it. Both are lined with vegetable-tanned leather, cut 12 to 24mm in three lengths or a custom one, and both belong to the Vintage Horween series.