Balance spring question

A quick learner from Grants pass, or says:
July 25, 2019
Hi, my balance springs says ?25 A Caldwell CM? . What would be the correct part number on your websites chart. Thank you
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Bob from SWISCO responded:
July 30, 2019

Thanks for writing in. Good question! If your stamp code reads as 25A, this conforms to our stamp option of 2510, which is for a window sash that weighs 5 through 9 lbs. Let me know if this sounds right. Many thanks.
26" Series 385 Channel Balance
26" Series 385 Channel Balance
S385-26
$10.55
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