https://antiqueseththomas.com Sat, 12 Sep 2026 18:42:43 +0000 en-US hourly 1 https://wordpress.org/?v=4.1.1 https://antiqueseththomas.com/antique-seth-thomas-adamantine-mantel-shelf-89ad-clock-1916b-with-key-pendulum/ https://antiqueseththomas.com/antique-seth-thomas-adamantine-mantel-shelf-89ad-clock-1916b-with-key-pendulum/#comments Sat, 12 Sep 2026 18:42:43 +0000 https://antiqueseththomas.com/antique-seth-thomas-adamantine-mantel-shelf-89ad-clock-1916b-with-key-pendulum/



















Antique Seth Thomas adamantine clock with key and pendulum – 17″ wide, 7″ deep, and 10.5 tall – good cosmetic condition – untested item from estate – I would guess this has been stored for DECADES AND DECADES and would likely need cleaning to properly test? Shelf location is “GR7″.

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The product is a 1910’s antique Seth Thomas mantel shelf clock that is working correctly. This original clock, manufactured in the United States in the 1920s, features a mechanical movement and fits the antique style. With its historical significance and craftsmanship, this clock would make a desirable addition to any collection of decorative collectibles, especially for those interested in vintage desk, mantel, and shelf clocks.

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Item shown in the pictures is the actual product you will receive. See pictures for details, if you have any more questions just send a message. These come from a non-smoking home. Please view our other listings for more great items!!

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Antique Seth Thomas Rosewood Adamantine 8 Day Mantel Clock w/Key Works. This is a very nice Seth Thomas mantel clock. It has a wood cabinet that I believe has rosewood veneer. It is a dark reddish brown color. This clock keeps good time and has been running accurately for 2-3 days. It is 10″ tall and 8.5″ wide. The face has scratched areas where the keyholes are. This comes with a key.

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Antique Seth Thomas 8-Day Mechanical Mantel Clock. Beautiful early 20th-century Seth Thomas mechanical mantel clock that has been in our family for generations. This clock belonged to my husband’s grandmother and has remained in the family ever since. We are now offering it to someone who will appreciate its history, craftsmanship and wonderful mechanical character. The clock features a Seth Thomas mechanical 8-day time-and-strike movement, believed to be from the No. It is key wound and includes its pendulum and a replacement winding key. Seth Thomas mechanical movement. 8-day key-wind operation. Hour and half-hour strike. Coiled gong. Original pendulum. Replacement winding key. Convex glass. Brass bezel. Fast/Slow regulator. Beautiful reddish-brown wood-grain / Adamantine-style case finish. Made in USA. The clock is currently running and striking. Videos are included with the listing to demonstrate its operation and sound. As with any antique mechanical clock, adjustment may be necessary after the clock is moved. No representation is being made that it has recently been professionally serviced, and long-term accuracy or future servicing requirements cannot be guaranteed. The clock presents beautifully for its age and retains a rich antique patina. There are scratches, finish wear, small areas of loss and other age-related imperfections. Please examine all photographs carefully, as they are an important part of the condition description. This is not a recent estate-sale or resale acquisition. The clock has been in our family for generations and belonged to my husband’s grandmother. A wonderful piece of American clockmaking history for a collector or as a functional antique for a home, study or office.

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Seth Thomas Adamantine Mantle Clock 6-Pillar & Ornate Brass Accents Vintage. Working, it needs the time set. Clock mechanism in excellent condition. Has the original wind-up key. There is the Seth Thomas logo mark on the mechanism. Clock winds, ticks, chimes on the hour and half hour. It needs the correct time set. No clear date stamp. There is number on the clock plate of 890. All 6 pillars in great condition. Dimensions: Width 17″ x Depth 7″ x Height 11. Owning this Vintage Seth Thomas Mantel Clock is like owning a piece of living history, a reminder of the artistry and craftsmanship that once defined the world of horology. This beauty is an Adamantine clock. The material is a faux marble veneer, developed by Seth Thomas in the 1800s. A great piece for decor or for tinkering! Please review all pictures as condition is subjective. Do you believe price is a little high, no problem, the “Best Offer” option is activated. Please closely examine the listing and let me know if you have any questions, I’m happy to help! Pictures may not reflect true colors due to various lighting conditions. Smoke free and pet free environment. Be sure to add me to your favorites list – opens in a new window or tab! Thank you for stopping by my store and I hope you will visit again soon.

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ANTIQUE SETH THOMAS 4 PILLAR ADAMANTINE MANTLE CLOCK W/89C MOVEMENT READ F/S.

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Antique Seth Thomas Adamantine Mantel Clock 8-Day, Time/Strike, Key-wind. It’s in working condition. Strikes the 1/2-hour one time and counts the hour. Measures: tall 11-1/4″, wide 16-1/4″, deep 6-1/4. In nice condition clock. Please see all photos for details. If you have any questions, please ask. Please check out my other items for sale!

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This Seth Thomas Adamantine mantel clock features a classic architectural silhouette, finished in a deep black veneer with striking faux-marble inlays on the crown and base. The front panel is decorated with gold-tone incised floral scrolls, and the case sits on four detailed, scrolled cast metal feet. Movement: 8-day brass mechanical movement, Made in U. Case Material: Wood with and cast metal hardware. Features: Roman numeral dial, decorative brass-tone bezel, and rear bell strike. Mechanical: The clock is in working condition. It has been tested and successfully runs until the spring winds down.. It has run for several days without any stopping.. While it is currently operational, it has not been tested for long-term timekeeping accuracy and may require the standard cleaning or adjustment expected of a mechanical movement of this vintage. Case: The Adamantine finish remains glossy with vibrant color. There is a small chip in the veneer on the lower-left corner of the base, and the cream-colored dial shows a natural aged patina and foxing. Labels: Partial remnants of the original paper labels are present on the rear of the case, including the 1880 patent date and model identification No. Please don’t hesitate to ask any questions you may have and thank you for looking.

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Antique Adamantine Seth Thomas 8 Day Chime Mantle Clock Working. A Working Example of this Fine Clock. Made by Seth Thomas, Connecticut. 8 Day Chime Clock, With Adamantine finish. Comes with Pendulum and Key. Measures 11 Inches High, 16 1/2 Wide.

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