Le Chronographe Monopoussoir Louis Erard x Massena LAB Silver Technical specifications Case Case material Stainless steel Case diameter 43 mm Case back See through Glass Domed sapphire crystal with anti-reflective treatment on both sides Water resistance 5 bars (50 m/165 ft) Dial & hands Dial Rhodium-plated outer flange and counter with circular satin-finish and diamond-cut corners, rhodium-plated lower plate with grained finish and silver opaline counter centre, black transfers Hands Leaf-shaped hands in blued steel Movement Calibre Sellita SW500 MPCa Movement Automatic Functions HM + chronograph Power reserve Around 48 hours Strap Black grained calf leather with tone-on-tone attachment points, blue grained calf leather lining, functional catch spring bars enabling the strap to be changed quickly Buckle Pin buckle