Paul from SWISCO responded:
April 15, 2016
Thanks for posting, Norma. I believe you have an older version of our S380-30 channel balance. The bottom shoe looks a little different, but I think ours will still work. As for the stamp option, I recommend weighing your sash on a scale to determine the weight, then referring to the chart we have on the S380-30 store page. That will let you determine the best match.
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