Seth Thomas
Navy MK I Deck Clock

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Naval Observatory Seal 

Seth Thomas, America’s oldest clock maker started operations in 1813.
Their Nautical clocks first appeared in the 1860’s and were the official US Navy Ships’ clock for almost 100 years


A WW II vintage ships clock with a nickel plated bronze case
and mounting. A real collector’s piece!

Presented is a Seth Thomas WW II
ship’s bulkhead clock which was manufactured in accordance with military specifications 18C-11 and 18C -13. This waterproof clock
was made to be mounted on a bulkhead in the wardroom, bridge or ship’s office. It has a 5 1/2 inch
dial which is of an unusual two piece design with a hinged front section, and is adjusted and wound from the

The clock is fitted in a swing left-open bezel. The movement is the same as would be found in a Chelsea clock
made to the same specifications. It is an 11-jewel 8 day  movement that is wound, set and adjusted through
a slotted cover at its rear. A separate start/stop mechanism at the rear allows it to be synchronized with a master time

The removable vibration dampener is spring loaded and attaches to the bulkhead when the front of the case
is removed by pulling its hinge pins. The front of the case also serves as a watertight closure and has a ridge that
seals into a groove in a rubber gasket. The bezel is dogged by turning a chrome wing nut and all is secure. The shock absorbent
rear bracket is frequently missing form these clocks. 

White spade hands with colored tips on a black dial
with acid etched Arabic numerals in white. The tan dots at the top of the numbers at one time held iridium for night
use, but that has since been removed. Iridium and radium are radioactive and there use has been suspended.


This clock has been certified by the U.S. Naval
Observatory assigned their own serial number 15592 and dated 1941.

SETH THOMAS is etched below the lower rim below the 6 hour mark
and reads, Made by Seth Thomas in USA.

The case is of heavy forged bronze, and it is of a design and was the most sophisticated of ship’s clocks of this
era other than chronometers. The nickel plating has a rough surface and some buyers might want to have it re-plated.
Other collectors might prefer preserving it as part of the clocks history

5 1/2″ 
Diameter of Dial                    3
1/2″ Deep
7 1/2″ Full Diameter                        
Weight 11 lbs

of mounting pad        
Very thick 3 1/2″ case
                          Movement is on left. Mounting pad on right

CONDITION: This example has seen 70 years
of service, mostly at sea, and gives the appearance of ruggedness. The face is in very good condition with little evidence
of aging. The hands have been repainted. It keeps excellent time and its age is indicated only in the older
design of the case and a very unusual style housing. The gasket between the bulkhead bracket and movement has hardened.
Because of the movement’s sandwich construction, there are no visible markings. Key is included.

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Shipping & Packaging

The cost of shipping, packing, handling, and insurance to your destination, will be calculated point to point and is an additional charge. You may email us to get these costs. We price our shipping honestly, but we expect to be reimbursed for the nominal cost of packaging materials and handling.

Our Unconditional 'No Nonsense' Guarantee

If not completely satisfied with your purchase it may be returned, if without damage, within three days of receipt in its original packaging. Return items must be insured for their full value. Only a prior email authorization by us for the return is required. Shipping charges are refundable if due to our error within the continental United States.

International buyers welcome, but inquire first. We have satisfied customers worldwide.

Standard Forms of Payment

Bank wire transfer, cashier’s check, money order, or personal check in which case the item will be held until cleared. Our prices are quoted net to us so that the use of credit cards or PayPal incur extra charges. Terms on overseas sales are different.

Established in 2003

Celebrating 18 Years of Exellence in Nautical Antiques

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