Louis Erard Le Régulateur Louis Erard x atelier oï Technical specifications Case Case material Stainless steel Case diameter 42mm 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 SW266-1 Movement Automatic Functions HMS Power reserve Around 38 hours Dial Black Or slate grey, matt and polished, 60 planed lines marking the minutes Hands Blue baton hands Strap “Covey” grey calf nubuck leather with tone-on-tone stitching, functional catch spring bars enabling the strap to be changed quickly Buckle Pin buckle