Anderson window balance

A handy person from Pennsylvania says:
Please give cost per set, the number I found is w4827987 the windows are27 yrs old.

Thank you
Julio
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Tom from SWISCO responded:
I don't recognize that number. Is that what is stamped on the balance box itself? We will only be able to identify what you have if we know each stamp printed on the balance box. It would be even better if we see pictures; sometimes seeing how the stamps are printed is just as important as the numbers themselves.
A handy person from Pa. says:
Please let me know if you received the picture.

Thanks ,Julio
User submitted a photo of a window balance.
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Tom from SWISCO responded:
Thanks, Julio, that's perfect. I recommend our 24-837, based on your stamp of "827."
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