This fascinating antique ammeter by the American Coil Co., Inc. of Foxboro, Massachusetts dates to the early 1900s and features a unique pocket watch-style casing with a built-in hanging ring and connectors. The instrument is marked “Pat. Dec. 22, 1903”, referencing an early electrical patent era when precision portable meters were becoming standard in industrial and engineering use. Housed in a metal case with its original leather protective sleeve, this rare piece is ideal for collectors of early electrical instruments, steampunk decor, or industrial antiques.
⭐ Key Features:
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Authentic American Coil Co. Ammeter, dated Patent Dec. 22, 1903
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Marked: “American Coil Co., Inc., Foxboro, Mass.”
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Compact pocket watch-style metal housing with loop and terminals
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Includes original fitted leather case
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Measures up to 30 amps (scale 0–30)
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Diameter: approx. 2.25", with leather case approx. 3.5" L
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Untested – sold as a display or collectible item only
📦 Condition:
Good antique condition. Some tarnish and oxidation to metal surfaces, consistent with age. Glass face intact, dial legible, pointer moves freely. Leather case shows wear and cracking but remains intact. Not tested for functionality.
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