I need help replacing my block and tackle window valances with the numbers 2630 BSI with an 18 pound sash
Bob from SWISCO responded:
May 17, 2021
This appears to be either a S380-27 or S385-27. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the illustration below for details. For a new stamp option choose 2630.