Replace Anderson balance

A handy person from Mechanicville Ny says:
Can't find any matching number .its a double hung window each glass panel measured around 19 15/16 width and 36 3/8length this window is around 1973
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Paul from SWISCO responded:
Thanks for posting. I'm afraid that size doesn't match up to anything. Can you show me a picture of each stamp printed on the existing balance? That will help us find the best match.
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