maybe 30 series 380 channel balance; need sash weight range

A quick learner from chula vista CA says:
I need new balances for the attached photos. can you determine which balance and sash weight by the photos?
Thumbnail of the uploaded file named 30 in balance 1.jpg
Thumbnail of the uploaded file named 30 in balnce 2.jpg
Thumbnail of the uploaded file named 30 in balance 3.jpg
Thumbnail of the uploaded file named 30 in balance 4.jpg
Profile picture of Emily
Emily from SWISCO responded:

Hello!

With this combination of attachments, you could have either an S380-31 or S385-31 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. If your stamp is "30 3", you'll need a 3030 stamp option.

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.
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.