Stamp on a Channel balance

A home owner from California says:
September 2, 2021
I am replacing the channel balances of a non-tilt window. The metal part measures 27 in, 1/2 in width. I can identify it as a 385 channel balance.

I cannot make sense of the stamp of my old channel balance. I need help.

It reads 26-3 GE5 CMC 75, and I have an Alpine window.

I am also attaching pictures so you can see what I am seeing. Thank you so much.
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Emily from SWISCO responded:
September 8, 2021

Hi there!

Thank you for your patience during our busy season! With this combination of attachments, you could have either an S380-27 or S385-27 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. As for the stamp, yours reads as "26-3" which means you'll need a spring strength option of 2630.

If you have any further questions just let us know! 

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
27" Series 380 Channel Balance
27" Series 380 Channel Balance
S380-27
$10.55
27" Series 385 Channel Balance
27" Series 385 Channel Balance
S385-27
$10.55
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