Balance stamp option

A quick learner from Omaha,Ne says:
I have a 2 series 710 balances that are 17" in length, but are stamped with 1690 stamp option for weight and I do not see that option listed. What would you recommend?
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Paul from SWISCO responded:
I recommend weighing your sash on a scale to determine the proper weight option. We have a list on the S710-17 store page showing how much weight each one supports. If your sash weight is not listed on the chart, let me know! We will do our best to find something that can accommodate your sash weight.
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