The familiar octagonal Colgate clock, facing Manhattan, dates back to 1924 and is a reminder of the time when factories dominated the city's waterfront. Its design was inspired by Colgate's Octagon Soap. The surface of the clock is 1,963.5 square feet and 50 feet in diameter. The minute hand is 25 feet, 10 inches long; the hour hand is 20 feet long. The timepiece can be adjusted and is maintained to stay within one minute of accurate time.
(I took the thumbnail from Google Earth since it shows the octagon shadow better.)