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.
Antique Hanging Scale for sale
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Antique Hanging Scale for sale
ANTIQUE C FORSCHNER Balance Scale, New York, Brass Face Plate, 0 - 25 lbs $25.99 - PicClick
Antique Hanging Brass Scales