Equal Arm Scale Value Guide

This antique equal arm balance scale, dating from 1880 to 1920, represents a classic lever-based measuring instrument used for precision trade and scientific inquiry. Crafted from brass and copper, these scales are highly collectible for their mechanical elegance and their historical connection to ancient Egyptian weighing principles.

What affects the value of Equal Arm Scale?

• The presence of a complete set of original known masses or weights significantly increases the $100-$150 value.
• Overall condition of the brass and copper, including the absence of heavy corrosion or structural bends in the arms.
• Maker's marks or stamps on the base or beam which can identify specific manufacturers from the late 19th century.
• The functional accuracy of the lever mechanism and the sensitivity of the balance point.

How to Identify Equal Arm Scale?

• Look for a central vertical pillar supporting a horizontal beam with two identical suspended pans.
• Examine the metal for the distinct patina of aged brass and copper components typical of the 1880-1920 era.
• Check for a pointer or needle at the central fulcrum that aligns with a scale to indicate a perfect balance.
• Verify the presence of original chains or rods connecting the copper pans to the brass arm.

History of Equal Arm Scale

Equal arm scales have been used for millennia, with the earliest known examples dating back to ancient Egypt. These scales operate on the principle of a lever, where an unknown mass is balanced against known masses. They were crucial for trade, scientific experiments, and even in legal systems to ensure fair exchange.