Peachtree balance replacement

A quick learner from Mobile, Al says:
I have a 26-1/4" Peachtree Balance,Product Code: S745-26. I don't know what weight stamp to order. My balance says 3660LK Caldwell. The balance is 26 1/4" long. I can't weigh the window but the visible glass measures 30.5" wide and 26.5" tall. What option should I choose? These window are heavy!
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Paul from SWISCO responded:
Thanks for posting. I believe you could use our 25.25.4 option for sashes weighing 20 through 25 pounds. I personally wouldn't go heavier, but you may want to weigh the sash on a scale to confirm that this is correct.
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