https://antiqueseththomas.com Thu, 10 Sep 2026 18:38:39 +0000 en-US hourly 1 https://wordpress.org/?v=4.1.1 https://antiqueseththomas.com/1939-seth-thomas-us-navy-mark-i-deck-clock-quartz-porthole-orig-movement/ https://antiqueseththomas.com/1939-seth-thomas-us-navy-mark-i-deck-clock-quartz-porthole-orig-movement/#comments Fri, 04 Sep 2026 06:25:43 +0000 https://antiqueseththomas.com/1939-seth-thomas-us-navy-mark-i-deck-clock-quartz-porthole-orig-movement/















Authentic 1939 Seth Thomas Mark I U. Navy deck clock, number N 1755, housed in its substantial original heavy watertight porthole-style case. A previous owner removed the original mechanical movement and converted the clock to a modern battery-operated quartz movement for convenient everyday use. The quartz mechanism uses one AA battery. The original mechanical movement and related parts shown in the photographs are included with the clock. Their completeness, operating condition, and suitability for restoration are unknown, so they are included as-is. The original black dial is marked Mark I – Deck Clock – U. Navy, ” dated 1939, and signed “Made by Seth Thomas in U. Because of the quartz conversion, the clock is no longer mechanically original, and the original subsidiary seconds display does not operate in its original manner. The clock retains its exceptionally heavy metal shipboard case with hinged front bezel, glass, mounting flange, rear housing, and aged gasket material. The case was designed for secure bulkhead mounting and has considerable weight. Vintage condition with scratches, scuffs, spotting, discoloration, finish wear, paint or residue, gasket deterioration, dust, and other signs of age, previous installation, and modification. Please examine all photographs carefully for the dial, hands, case, quartz conversion, included original parts, and overall condition.

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Marked Seth Thomas Made In U. You can hear it keeping time, ticking, no bell with this clock, the clock does’t strike half hour or hour. 3 holes in the back for securing to wall. A highlight to anyone’s collection or home.

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The Mark 1 Deck Clock is a vintage WWII piece from the United States Navy, specifically designed by Seth Thomas in 1943. Made of phenolic material, this antique original clock is a testament to the war time period and military craftsmanship of the era. With its working mechanism and accompanying key, this deck clock is a valuable and historical artifact for maritime enthusiasts and collectors alike. Clock runs well and includes key.

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MISSING GLASS and seconds hand. SEE PICTURES FOR CONDITION AND MEASUREMENTS. Clock ticks but is untested for time keeping accuracy.

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The 1941 Seth Thomas WWII US Navy Mark 1 Boat Clock is a rare and historical piece that served as a navigational tool on naval vessels during World War II. This antique original clock, made by Seth Thomas in the United States, features a porthole design and was used by the US Navy to keep accurate time while at sea. With its unique military history and craftsmanship, this clock is a valuable artifact that represents a significant period in maritime history.

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Marked Seth Thomas Made In U. You can hear it keeping time, ticking, no bell with this clock, 3 holes in the back for securing to wall. A highlight to anyone’s collection or home.

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See pictures for condition.

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Seth Thomas WWII US Navy Mark I Boat Clock 1941, Chrome finish, complete with original mounting plate. Used on PT Boats and Submarines. Runs and keeps good time. Dial and Chrome are in good shape. Comes with key and Oak wall mount. Dimensions: The case is 6 inches at its widest and 3.5 inches deep, the dial is approximately 3 3/4 inches. Note that WWII military clocks often contain radium on their dials for luminescence. Use appropriate caution if dismantling or servicing.

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Antique Seth Thomas U. NAVY BOAT CLOCK great for restoration needs. The case has its original unpolished patina. There Is an old bump on the ring. The glass has multiple cracks. The clock dial is loose and missing the key and clock hands. Sounds like there is something loose inside that slides around when you tilt it. This will make a worthy restoration project. Check out the photo’s for condition.

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MISSING GLASS and seconds hand. SEE PICTURES FOR CONDITION AND MEASUREMENTS. Clock ticks but is untested for time keeping accuracy.

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