25 4 Channel Balance stamp

A home owner from Roy WA says:
Need help deciding which option to choose for the 385 series channel balance....My old ones are stamped with:

25 4 KO Caldwell

I was assuming that it was the 2540 stamp option, But before I order ... I wanted to make sure
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Paul from SWISCO responded:
Yes, a stamp of 25 4 usually corresponds to our 2540 option. You can always weigh your sash to confirm, as well.
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