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New Style - Constant Force 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 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 Number of Coils: TWO- If you have one coil, your in wrong product category Coil Diameter: 1/2 inch wide Coil spring Number on Coil: Number is embossed on the side of each spring. ( this determines the strength of the balance - Select from List below) NOTE: Sold Each - Best if Replaced in Pairs, Should not mix old with new PLEASE Check all Dimensions Choose Coil Weight from List below Number Stamped on Each Coil Spring 440 / 440 440 / 540 540 / 540 640 / 640 740 / 740 Note: For Other combinations - Contact office |