window balance identification help

A professional from raymond mississippi. says:
i need help locating the type of window sash i have at my facility. only marking on it is 21-3 ga2 cmc 24. i think i ordered from you several yrs. ago.
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Donna from SWISCO responded:
Welcome Back John

You did purchase from us in the past, one size balance:

22" Series 390 with stamp option 2130
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