Window Balance Stamp

A home owner says:
I am looking to replace the window balances throughout my house. Two of my windows have 1700 and 1600 stamped on them. I do not see 00 as a weight option. What would be comparable?
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Tom from SWISCO responded:
I can't say for sure. I recommend weighing your sash and referring to the chart on our S770-17 store page to confirm.
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