What sash balance do i have?

A quick learner from CA says:
August 13, 2015
Is this the correct replacement: 32" Series 350 Channel Balance / Product Code: S350-32?

my stamped #s are 310S 30

32" in length / 9/16" width / 5/8" depth

my plastic ends match your pictures

just don't know about the 'stamp option"

Window is H-LC30-44x77
Profile picture of Tom
Tom from SWISCO responded:
August 14, 2015
The the nylon attachments are the same as our Series 350 channel balance, then that's what I would go with. The option is based on your stamp, though I don't recognize yours. You will need to get the weight of your sash and compare it to the chart we show on the S350-32 store page to determine what will work. You can determine the weight of your sash by simply removing it from the window and weighing it on a scale.
32" Series 350 Channel Balance
32" Series 350 Channel Balance
S350-32
$11.52
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.