please identify part number of item in the picture I provided

A home owner from CA says:

the measurement in the picture is 27 inches, and there is also a label in the picture, hopefully that can help you to identify the part number.

Thanks

Junguo

Thumbnail of the uploaded file named non-tilt-window-channel-balance-p1.jpeg
Thumbnail of the uploaded file named non-tilt-window-channel-balance-p2.jpeg
Profile picture of Bob
Bob from SWISCO responded:

Hi Junguo. This looks like either an S380-27 or S385-27 . The only difference between these two balances is the depth of the bottom nylon shoe, or 'heel-to-toe' measurement, so compare both with your old hardware to see what matches best. For a new stamp option choose 2630. 

S380vsS385
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