We don’t usually get the words ‘retro’ and ‘MB&F’ in the same sentences, but fear not the pieces is ‘retro’ in very MB&F-y sort of way. The case paying tribute to 1940s and 50s automotive aesthetics is a combination of milled sapphire crystal and grade 5 titanium. And it’s quite huge measuring 57mm at its widest point. Two flying balance wheels are visible through transparent pods at the back while differential that averages the output of both balance wheels sits in the central gearbox. The dial indicating hours and minutes is driven by conical gears. HM9 comes in two versions limited to 33 pieces each: the ‘Air’ edition comes with a dark movement and aviator-style dial; the ‘Road’ edition has a rose gold plated movement and classic speedometer-style dial.