stamp number

A handy person from fort myers, florida says:
May 22, 2014
I need a S385-36 balance, the one I took out was stamped 3518. Which option would I pick for that stamping. I was not able to weigh the window, it is 32x36 double pain aluminum frame.
Thanks for your help.
Marty
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Tom from SWISCO responded:
May 23, 2014
That's an odd stamp. What is the weight of your window sash? You can remove it and place it on a scale to find out. Then, compare that weight to the chart we have for the S385-36 to determine the best option. If your weight does not fall under any of the options listed on that chart, let me know.
36" Series 385 Channel Balance
36" Series 385 Channel Balance
S385-36
$12.27
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