andersen sash balance part says 11600-3 us patent nos 3335 455

A handy person from Ft Thomas KY says:
what part should I buy for replacements? Would all the balances be the same for my windows if installed at the same time? Are your prices for one single balance or for a pair?
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Tom from SWISCO responded:
Would you be able to show us a picture of these stamps? Sometimes seeing how the numbers are printed are just as important as the numbers themselves.

It's possible that not all your windows use the same balance. We always recommend double checking just in case. All of our Andersen balances are sold and priced individually, not in pairs.
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