Ulysse Nardin Marine Chronograph Annual Calendar Manufacture Watch 1533-150/40. UN-153 in-house manufacture automatic movement, with permanent seconds and calendar month indicatior at 9 o'clock position, 30 minute counter at 3 o'clock position and 12 hour counter at 6 o'clock position. Date window at 6 o'clock position. White lacquered dial with Roman hour markers, 43mm case made in stainless steel. Sapphire crystal front and exhibition case back. Water resistant to 100M. Black alligator straps with stainless steel double folding clasp.