Trying to order the correct channel balance.....

A contractor from Maryville, TN says:
March 29, 2019
Hello, I am in need of two replacement channel balances and I know they are 1/2" Series 700 for a non-tilt window and are 27" long but I'm unsure of which spring weight to order. The stamp number is 163. I will attach 3 photos....one of a similar balance that is the same but shorter....one is of the 163 stamp.....and the other is the manufacturer sticker from an identical window. Any help is greatly appreciated. Thanks!
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Paul from SWISCO responded:
April 1, 2019

Many thanks for your correspondence. For your S700-27 Channel Balance, your spring weight code of (163) is equivalent to our stamp option of 2630. This will hold a sash weight in the range of 13 through 19 lbs. The (163) was a Japan spring weight code used a long time ago.
27" Series 700 Channel Balance
27" Series 700 Channel Balance
S700-27
$11.52
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