Old Style - Constant Force coil Balance System
used by several Companies including Hurd, Capitol, Metal Industries, Coronet and others.
Each Coil spring has a number embossed on the side that determines the strength of the balance.
They may have one or more coils and the coils may have different numbers on each coil if used in Doubles
Number of Coils: One - If you have two coils, your in wrong product category
Coil Diameter: 1/2 inch wide Coil spring
Number on Coil: Number is embossed on the side this determines the strength of the balance.
Plastic Balance shoe: 1-1/4 Wide and 17/32 thick. (shade over 1/2 inch thick)
Overall Length: 2-7/8 inches prox. depending on coil size
Sold Each - Best if Replaced in Pairs, Should not mix old with new
Choose Weight below
Number Stamped on Coil
Single Coil: 335, 440, 5or540, 6or640, 7or740, 8or840 832
Double Coil: 335/335, 440/440, 440/540, 540/540, 540/590, 540/640, 640/640, 740/740, 840/840