Searching for 2440.j

A quick learner says:
house built in 1991.
1/2" wide, 25" long, 2440.J stamped on channel.

Thanks,
Wayne.
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Bob from SWISCO responded:

Thanks for writing in, Wayne. It's hard to tell since your balance's bottom attachment looks damaged, but this looks to me like either our S351-25 or S390-25. The only difference between these two balances is the 'depth' of the bottom nylon shoe. I recommend you obtain the other balance from this window and see if it's shoe is undamaged, then compare it with both of the balances I recommended to see what matches best. In either case you will need a stamp option of 2440. 

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