Help with weight stamp

A quick learner from Oceanside, CA says:
September 18, 2022
I'm looking to buy 4 of you 380 products but not sure what weight stamp to buy. Can you help with that option. 27" length, 1/2 width and 1" base guide
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Emily from SWISCO responded:
September 21, 2022

Hello!

There should be a stamp on your balance's metal channel that would indicate what option you would need. If there is no such stamp, you will need to weigh your sash on a scale and refer to the chart under the product description on the S380-27 store page to determine the appropriate spring strength option for your balance.
27" Series 380 Channel Balance
27" Series 380 Channel Balance
S380-27
$10.55
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