Original Item: Only One Available. This is a genuine U.S. Navy type Mark I Deck Clock, made by Seth Thomas. It is mounted in a dust proof and moisture proof black phenolic case with a 5 1/4" dial. It features hour and minute hands on the main dial, with a smaller dial for the seconds.

There is no warranty for this clock and returns for a non-working watch will not be honored. Please note all clocks are wound and tested then recorded on video before shipment. We are not in the repair business- ALL SALES ARE FINAL.

The case for the clock opens up to show the back, which shows the three small flathead screws holding the face to the case. The key is still present which winds the clock and sets the time. There is an adjustment for the speed of the clock, as well as a "STOP" hacking function to freeze the seconds for clock synchronization. We have wound the clock, and it keeps good time.

The face reads as follows:

MARK I- DECK CLOCK
U.S. NAVY
(N) 34685, 1941

The Seth Thomas Clock Company was founded by Seth Thomas and began producing clocks in 1813. It was incorporated as the "Seth Thomas Clock Company" in 1853. The company manufactured clock movements for the Self Winding Clock Company from 1886 thru the early 1890s, in addition to its standard offering of longcase clocks, mantel, wall, and table-top clocks.

Many Seth Thomas clocks from 1881 to 1918 have a date code stamped in ink on the case back or bottom. Usually, the year is done in reverse, followed by a letter A—L representing the month. For example, April 1897 would appear as 7981 D, this example is a much later produced one and where the date code there is the serial number 34776, followed by the year 1941.

On May 7, 1926, Seth Thomas Clock Company filed with the United States Patent and Trademark Office for trademark protection of the Seth Thomas brand with regard to clocks. The trademark was granted with a registration date of October 12, 1926 and assigned registration number 0219268. The trademark is still active as of the last renewal date of February 17, 2017.

The Seth Thomas factory made countless clock movements during and prior to the second world war.

Clock face measures approximately 5 1/4 inches in diameter, with the outer housing measuring about 6 3/4 inches in diameter at the front, and 8 1/2 inches at the back. It measures about 4 1/2 inches deep.

The United States Navy used Mark 1 Deck Clocks throughout WWII to help indicate the time while on deck, and afterwards. Would make a perfect clock for your desk at work or at home!