This is a two-tier knob (stack type) from HATA. It's black with a smoked (hairline) finish, giving it a calm appearance. Currently, ordering this stack knob is very expensive (listed at 71,500 yen). It's equivalent to the one currently sold for 25,300 yen on the official web shop as "(Limited Stock) [-HATA-] Lower Hirame・Two-Tier Knob (Special Order)". Thank you.