The spring loaded system appear to be working. Believe this one to be from late 1800s or early 1900s since it does not have the patent date on it.
Scales, Mercantile, Trades & Factories, Antiques - PicClick CA
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C. Forschner's 25 Lb Hanging Scale - Ruby Lane
Antique C Forschner's Balance No 2 New York Hanging Scale 24 lb, Black & Brass
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