Spiral balance spring

A quick learner from Moline, ILL says:
This spring broke into two parts. It fits Pat. 5,353,548 do I order a 7 spring?
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Bob from SWISCO responded:

I am afraid patent numbers really aren't that reliable, as many different pivot shoes can use the same one. I believe you might have our 15-087 though, which uses the Series 180 Coil Springs. Please confirm. If so, yes, a 7 stamp means you can use the S180-7 7 pound spring.

Series 180 coil balance diagram
Series 180 coil balance diagram
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