https://antiqueseththomas.com Thu, 01 Oct 2026 07:19:44 +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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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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The 1940 Seth Thomas WWII US Navy Mark 1 Deck Clock is a rare and valuable piece with a chrome-plated case, making it a collector’s item. This antique clock holds historical significance as it was used by the US Navy during World War II, showcasing the craftsmanship of the Seth Thomas maker. The brass and chrome materials used in its construction add to its durability and timeless appeal, making it a unique piece of maritime memorabilia from the United States. We are not clock people. Please see condition area for more details.

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Deck clock in good condition. My dad believed this was off the USS Flasher. Upon removing the movement, the serial number is off by 1 digit from the one written on the tag. The number could have been misread, and this is the clock from the crew’s quarters but there is no way to be sure. My Dad passed last year and no doubt new of the discrepancy on the inventory tag and believed this to be off that sub. Either way it’s a beautiful piece of history.

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With Key Not working wound tight.

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The 1942 Seth Thomas Mark I Deck Clock is a vintage original piece from World War II, specifically designed for the US Navy. Made by Seth Thomas, a well-known maker of maritime clocks, this clock features a Bakelite exterior, giving it a unique and durable construction suitable for use on deck during that era. This historical clock serves as a valuable and authentic piece of maritime memorabilia, representing the military precision and craftsmanship of the time. At the end of this listing I will remove and keep.

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The attribution is due to in formation on page 781 of Tran Duy Ly’s, Seth Thomas Clocks & Movements, Third Edition, Volume 2. The face has scratching around the winding stem.

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Despite not having a key and being untested, this clock would make a unique and historically significant addition to any collection of maritime antiques. Small hand tip is broken off. Hands do move freely but untested other than that.

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This clock is a rare find as it is still running well and includes the original key. The Seth Thomas brand, known for its quality timepieces, adds to the appeal of this unique and authentic piece.

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The US Navy MARK I Deck Clock from 1942 by Seth Thomas is a valuable collectible item in the maritime clock category. This clock was specifically made for the US Navy, showcasing a strong historical and military significance. As a well-known maker of maritime timepieces, Seth Thomas adds a level of authenticity and craftsmanship to this deck clock, making it a coveted piece for collectors and enthusiasts of antique maritime artifacts.

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