What Stamp Option should i choose

A handy person says:
There are no numbers on the sash. The window weights about 15lb. Based on this which stamp option would be best. The 2030 12-15lb or the 2040 15-23lb.

Thanks
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Paul from SWISCO responded:
You say it weighed about 15 pounds, but what was the exact weight? If it was over 15 pounds, go with 2040. If it was under, go with 2030. Also, what was stamped on your original balance?
A quick learner says:
Thanks for info.

It weighs exactly 15lbs. There were no numbers stamped on balance.
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Paul from SWISCO responded:
In that case it will really be up to your best judgement. Personally, I would go with the 2030, but it's up to you.
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