Can you tell which Channel Balance I Need?

A quick learner says:
March 1, 2019
The channel is 25"x9/16 the stamp is 2440y.
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Bob from SWISCO responded:
March 1, 2019

Thanks for posting. See either our S351-25 or S390-25. The only difference between these two balances is the 'depth' of the bottom nylon shoe. The Series 351 bottom nylon shoe has a depth of 1", whereas the Series 390 bottom nylon shoe has a depth of 1-1/8". Compare with your old balances and see what you think matches best.

Once you pick a balance, you'll need to choose a stamp option of 2440, for a window sash in the weight range of 19 through 24 lbs. 
25" Series 351 Channel Balance
25" Series 351 Channel Balance
S351-25
$10.77
25" Series 390 Channel Balance
25" Series 390 Channel Balance
S390-25
$10.55
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