A quick learner says:
2730 28 inch
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Tom from SWISCO responded:
I'm not sure what your question is. Are you looking to replace your balance? If so, I'm not sure what you have. The stamp only tells us how strong the spring is; it is not used in identification. I recommend that you look at our Channel Balance Home Page and follow the steps in order to find the Series that best matches what you have.
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