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Seth Thomas Adamantine mantle clock. From the late 19th century. The clock features a marble or wood-grain finish created using the patented Adamantine veneer process. Seth Thomas Clock Company, a renowned American clockmaker. Produced around the 1880s to early 1900s. The “Adamantine” finish is a durable, early plastic veneer (celluloid) applied over a wood case to mimic the look of materials like marble or mahogany. Typically an eight-day, mechanical movement that strikes the hours on a gong and the half-hours on a bell. Features a decorative, ornate brass or painted celluloid dial with black Arabic numerals.

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