Louis Erard Petite Seconde Lapis-Lazuli 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/165 ft) Movement Calibre Sellita SW261-1 Movement Automatic Functions HMS Power reserve Around 38 hours Dial & hands Dial Openworked lapis lazuli, snailed opaline (matt silver) counter at 6 o'clock, glossy silver indexes, anthracite transfers on the counter and white transfers on the lapis lazuli part Hands Signature fir tree rhodium-plated hands Strap Morning blue 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