The 27 C normally translates to 2730. To verify stamp, remove the window sash and place it on a scale.
A 28" Series 390 with stamp number 2730 will carry a window sash weight range of 13 through and including 19 pounds.
This information is based on 2 channel balances per sash. Balances are designed assuming friction in the jamb weather-strip will carry a portion of the sash weight. Suggested sash weights are approximate.
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