Louis Erard x The Horophile La Petite Seconde Metropolis Green Technical description Case Case material Stainless steel Case diameter 39 mm Case back See through Glass Domed sapphire crystal with anti-reflective treatment on both sides Water resistance 5 bars (50 m/1 Dial & hands Dial Green, circular satin-finish exterior and counter, gadrooned centre, black transfers Hands Polished rhodiu-plated "Empire" shape (skeletonized stepped baton) Movement Calibre Sellita SW261-1 Movement Automatic Functions HMS Power reserve Around 38 hours Strap Light brown calf leather strap with tone-on-tone stitching, black grained calf leather lining, functional catch spring bars enabling the strap to be changed quickly Buckle Pin buckle