This watch is also known as:
IW3770-13 , IW377013 .
Features a Perpetual Calendar, Chronograph & Minute Repeater all in 1. Perpetual Calendar indicates: Day (sub-dial at the 9 o'clock position) , Date (sub-dial at the 3 o'clock position), Month (sub-dial at the 6 o'clock position), Moonphase (sub-dial at the 12 o'clock position) & Year (window between the 7 & 8 o'clock position). Chronograph Indicators is in the center of the Month & moonphase sub-dials (located the 6 & 12 o'clock positions), Offset Seconds Hand in the center of the Day sub-dial (located at the 9 o'clock position). Minute Repeater activated by the lever on the left side. Power Reserve of 44 hours.