Balance springs broke both sides. Removed part of the spring. Approximately 7/16"
Dotted markings probably 7Z
Thanks
Ron
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Bob from SWISCO responded:
June 21, 2021
Hi Ron. This looks like a Series 180 Coil Balance spring. If the stamp reads '7' you might need our S180-7 7 pound spring. If in doubt, weigh the window sash. Give me that exact weight and I can work out all the spring weights you need. These springs work with our 15-087 Pivot Shoe, 15-086 Coil Housing and 16-024 Bracket. See the diagram below. 
Detail of 15-086
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