Louis Erard Le Régulateur Tourbillon Alain Silberstein blue Technical specifications Case Case material Microblasted grade 2 titanium & polished grade 5 titanium Case diameter 40 mm Case back See through Glass Sapphire with anti-reflective treatment on both sides Water resistance 10 bar Movement Calibre BCP T02 Movement Tourbillon régulateur mechanical hand-wound Functions Tourbillon HMS Power reserve approx. 100 hours Dial Blue with white transfers, black counter at 12 o'clock, white and red transfers, cut out at 6 o'clock to see the tourbillon, black flange featuring white and red indexes Hands Alain Silberstein signature hands: red lacquered hour hand, white lacquered minute hand and yellow lacquered second hand Strap Blue nylon and microblasted grade 2 titanium functional catch spring bars allowing the strap to be changed quickly Buckle Hook-and-loop fastener system