Continuing with the bronze saga, Tudor just launched a grey bronze Black Bay that joins the blue Bucherer and brown bronze Black Bay editions.. The new Tudor Black Bay Bronze Slate Grey ref. M79250BA-0001 comes equipped with the same Bronze/Aluminum alloy case measuring 43 mm as its brown and blue dial siblings. Regardless of the larger case diameter when compared to the Black Bay in stainless steel, the Bronze version doesn't wear that much bigger, to be quite frank.