In 2015, Tudor launched the North Flag, named for a key moment in Tudor's history, the British North Greenland Expedition. The North Flag was the first Tudor model to be fitted with an in-house movement, calibre MT5621. During 2016 and 2017, “Manufacture” movements were introduced across all of Tudor's sport watches and the Black Bay line of diver's watches was broadened. In 2018, Tudor announced the Heritage Black Bay GMT at the Baselworld fair. It was the first Heritage Black Bay model to have the GMT function with the in-house, COSC-certified MT5652 movement. The blue-red bezel design is also a homage to the Rolex GMT Master Pepsi model from their sibling brand Rolex. Also launched at Baselworld 2018 were the 1926 and Black Bay 58, two heritage-inspired lines named after the year Tudor was trademarked and the year the first 200 meter water-resistant Tudor Submariner was released, respectively.
