Andersen balance Id

A quick learner from USA says:
I have an Andersen sash balance that says:

C1964 33 785
Visible glass is 20" high x 24" wide

the other window sash balance says:
1964 33 785
Visible glass is 26" high x 28" wide

I can't find this on your website. Do you have it?
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Tom from SWISCO responded:
Thanks for posting. The second stamp for each one are the important detail. However, I'm not sure which number is essential here. Could you show me a picture of that string of numbers? Seeing how they're printed is as important as the numbers themselves.
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