black horse culatta leather watch strapthe minimal watch strap has been cut from a butter soft full grain 1. 2mm vegetable tanned, washed and tumbled horse culatta leather with an aniline rotten corpse matte black dye treatment. culatta is a special cut combined of the rear just above the cordovan, the belly middles and the hind shanks, offering a dense structure, tight grain and medium to firm temper. vegetable tanning is a traditional method of treating the hide using natural extracts