Channel Balance Sash Weight Range

A handy person from Brentwood, CA (Northern California says:
I have selected the 380 Series to replace one in the window whose cord is broken.
I do not know the weight range for a home window. The current Channel Balance is marked "25 5 JV CMC 2" What is the correct Stamp Option to order?

I will purchase two per your suggestion.
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Mike from SWISCO responded:
I can't determine your stamp option from those numbers, unfortunately. The only way to accurately judge your stamp option would be to weigh the sash. We highly recommend that you weigh it on a bathroom scale and compare to the chart on the S385-25.
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