Channel balance replacement

A home owner from Aldie va says:
April 23, 2017
I have a Chanel balance that measures 29inches X 1/2 X 1/2. It's stamped 28.5. It looks like this model 29-inch/pd/Series-795-Channel-Balances/S795-29

I don't know what option to choose. I read your forums but I don't know the sash weight. I put the window on my scales and it weights 19lbs but I don't know how accurate my scale is.
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Tom from SWISCO responded:
April 25, 2017
I'm afraid your pictures didn't come through. However, if your sash is 19 pounds then I would recommend our 29C option. Just triple check to make sure this is accurate. That is ultimately the only way to be 100% sure what stamp would be best.
29" Series 795 Channel Balance
29" Series 795 Channel Balance
S795-29
$13.77
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