What channel balance do I need?

A quick learner from Seattle says:
June 6, 2021
Window weights about 15 pounds.
Marking on existing channel balance: 11 9 18# CALDWELL DM
12 inches long, 0.5 inches in width, shoe 1-3/32 inches

Do I need a S385-12 stamp 1150?
Thumbnail of the uploaded file named Window1.jpg
Thumbnail of the uploaded file named Window2.jpg
Thumbnail of the uploaded file named Window4.jpg
Thumbnail of the uploaded file named Window5.jpg
Thumbnail of the uploaded file named Window3.jpg
Profile picture of Paul
Paul from SWISCO responded:
June 10, 2021

Hello,

You're correct, you'll need the S385-12 channel balance, and the spring stamped code will be 1150 for a sash weighing between 12-15 lbs. If the sash is over 15 pounds, we'd need to look into having these custom-made for you. Thanks for posting! 
12" Series 385 Channel Balance
12" Series 385 Channel Balance
S385-12
$9.34
How to Replace a Non-Tilt Channel Balance
How to Replace a Non-Tilt Channel Balance
VIDEO
WATCH >
How to Repair a Jammed Window
How to Repair a Jammed Window
VIDEO
WATCH >
How to Identify Replacement Channel Balances
How to Identify Replacement Channel Balances
VIDEO
WATCH >
How to replace a non-tilt channel balance
How to replace a non-tilt channel balance
GUIDE
READ >
Choosing a Non-tilt Channel Balance: What Will We Need?
Choosing a Non-tilt Channel Balance: What Will We Need?
GUIDE
READ >
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 3-4 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at (888) 991-1929 or at help@swisco.com.