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.
Old Brass Tool American Improved Spring Balance Hanging Scale 24
CHAS. FORSCHNER & Sons Brass Hanging Scale $109.95 - PicClick
VINTAGE FORSCHNER'S IMPROVED Circular Milk Scale £37.92 - PicClick UK
C. Forschner's Brass Balance No 2 Scale 24 Pounds New York Antique
ANTIQUE HANGING SCALE FORSCHNER CO 30 lb Vtg Primitive Brass Face
VINTAGE ANTIQUE BRASS Morton & Bremner Spring Balance 24lb Scale - New York $20.00 - PicClick
Antique Vintage Hanging Scale C. Forschners Balance No. 2 New York
Antique Chatillon Hanging Scale.
ANTIQUE C FORSCHNER Balance Scale, New York, Brass Face Plate, 0 - 25 lbs $25.99 - PicClick
C. Forschner's 25 Lb Hanging Scale - Ruby Lane
Vintage Ceiling Hook, Forschner Hand Held Butcher Hanging Scale
Vintage John Chatillon And Sons Market Scale
ANTIQUE HANGING SCALE FORSCHNER CO 30 lb Vtg Primitive Brass Face Tin Tray, NY $97.00 - PicClick
ANTIQUE OLD MANCUR Scale Spring Balance Hanging Brass Iron Spring Scale Pud 1800 £47.02 - PicClick UK
C. Forschner's Brass Balance No 2 Scale 24 Pounds New York Antique