Bob from SWISCO responded:
July 1, 2020
This looks like either an S380-20 or S385-20, depending on the depth of the bottom nylon shoe. Your stamp option of 19-9 is from an older rating system we do not use. To know what stamp option to select, obtain the exact weight of your window sash. You can then match that exact weight with one of the weight ranges listed alongside each stamp option on the balance shop page. |