Chelsea Clock Co. 10" Special Dial Yacht Wheel Clock with base aka Mariner Ships Bell Clock for Tiffany & Co., New York. Chelsea yacht wheel clocks are the quintessential ships bell clock design. They were offered with dial sizes of 2 3/4", 3 1/2", 4 1/2", 6", 8 1/2", 10" and 12". The 10" and 12" dialed examples are exceedingly rare. In fact, this is the only Chelsea 10" Mariner known to exist. Standing 27 1/2" tall, 21" wide and 9" deep and weighing 65 pounds, the clock has truly commanding presence. Serial number 172995 dates the clock to 1926. The clock has been restored and is in superb condition. Simply, the best!