window balance, 35" long metal with 1" depth bottom shoe, markings are 34-9 BA CMC 4

A home owner from 33908, Ft Myers, FL says:
January 8, 2022
Hi,
Based upon the shoe depth, I assume this is a 380 series window balance. However I could not find a 3490 code for this listed in your selections ? Unsure what to order.
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Emily from SWISCO responded:
January 11, 2022

Hello!

Your stamp "34-9" is outdated and doesn't match any of our standard options. You'll need to weigh your sash on a scale to determine the appropriate option for your balance. There's a chart on the S380-35's store page that will show you which option you'll need based on the weight of your sash. 
35" Series 380 Channel Balance
35" Series 380 Channel Balance
S380-35
$12.05
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