Peachtree block and tackle balance

A handy person from Cincinnati says:
August 10, 2020
I think I need Series 745 balances for my peachtree windows (model # in photo) but the stamping does not match what is on your site. Mine says 3640 1 H but is indeed 16.25 and 5/8 x 5/8. and total sash is 14.5 lbs.
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Bob from SWISCO responded:
August 13, 2020

We've seen this issue before. If you're absolutely certain you have an S745-16, then this simply has a stamp code from a rating system that is no longer used. What you should do is obtain the exact weight of your window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option under the product description on the balance's product page.
16-1/4" Peachtree Balance
16-1/4" Peachtree Balance
S745-16
$13.79
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