Harry Winston will once again take part in the charity auction sponsored by the Principality of Monaco with the Ocean Dual Time Retrograde Only Watch, a unique piece as the inscription on the case back reads 'Only Watch Unique Piece'. The white gold case with a diameter of 44.2 millimetres houses a self-winding mechanical movement, calibre HW3502. This mechanism consists of 281 elements, has 32 jewels, a flat silicon balance spring and a skeletonised oscillating weight in white gold. The watch, which can display a dual time zone, has a clear separation of functions on the dial: off-centre hours and minutes at 1 o'clock, day/night indicator at 3 o'clock, date display at 5 o'clock and retrograde second time zone on the left side of the flange. The strap combines blue alligator leather with black rubber and is closed by a white gold pin buckle.