Andersen window balance

A quick learner from Columbia, MO says:
looks just like the one in your You-Tube video
measures 6 5/16"L x 3"W x 3/4"D
numbers on it: 11600A-3 and R18/1337 9 91

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Tom from SWISCO responded:
Thank you for posting. We're having a little trouble finding this balance. Could I see a couple pictures of the stamps on the balance box? Sometimes seeing how the numbers are printed is just as important as the numbers themselves.
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Donna from SWISCO responded:
We actually may have found a possible replacement. We are currently working on it and will let you know as soon as we have something for you to look at!
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Tom from SWISCO responded:
Please see our new 24-R18-1337 Andersen sash balance, which can replace balances with the stamp R18/1337.
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