Antique Salter's Improved Circular Spring Balance scales.
Class II. Accuracy stamp.
To weigh 30 lbs by ounces.
Height of brass section: 11.25 inches;
Diameter of dish: 11 inches.
Total weight: almost 2 kg (allow 2.75 kg once packed).
Reasonable condition for their age. - superficial marks & scratches but overall fine.
For mechanism, watch video below: