What stamp do I have

A home owner from michigan says:
I am looking to replace several pairs of 1/2 channel balances. First, I am not sure of a perfect match by looking at your selection: it appears that series 350 is the closest. Second, regarding the stamp option, 24 D is stamped on the side of my channel balance, but it doesn't match your selection. What is my next step to continue.
Thank you,
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Tom from SWISCO responded:
Hey, Matt. Usually a stamp of 24D corresponds to our 2440 option, but you should weigh your window sash and make sure it falls under that range just in case.
A home owner from ortonville mi says:
The window sash weighs 22 lbs. If the 2440 option that you recommended still applies, where can I find it?

I have discovered my windows are Weather Shield.

Thank you!
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Tom from SWISCO responded:
Hey, Matt. According to the weight chart on the page for the S350-25, two balances with the 2440 option can carry a window sash weight of 19 through 24 pounds. It looks like the 2440 is the best option for you.
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