Balance has 2320 stamped. It is 24" long, and almost 9/16 wide.
The sides are smooth, there are no protrusions.
The windows are aluminum, single hung, circa 1975.
Is 24" SERIES 377 CHANNEL BALANCE Product Code: S377-24 the replacement part that I need?
Bob from SWISCO responded:
February 17, 2022
I agree the S377-24 looks correct. So long as the fittings match our 19-018 Top and 15-005 Bottom (which has a depth, or 'heel-to-toe' measurement, of 1"), I think this can work for you. For a stamp option choose 2320.