If you are looking for vegetable-tanned leather with a real-quick patina and a sheen, this Pueblo leather from Badalassi Carlo, Italy, might be the answer.
They develop patina pretty quickly. They might look matte when new, but you will find them with a soft sheen and getting darker over time, like how vegetable-tanned leathers should.
Their marbled appearance comes from a buffing process, giving a lightly napped surface that will smoothen over time.
Legacy (Marine Dress Boot) Mark Last, Unstructured Badalassi Pueblo - Tabacco 270º Handwelted Flat Welt #1081 Cork Full Sole @dr_sole_originals