Jasmine from SWISCO responded:
April 28, 2023
Thanks for posting! Your balances appear to be the S385-27 channel balance. Given that your stamp is '35 DS 35', it is likely that your sash weighs 35lbs. So you'll need the 3560 stamp which is rated to carry 35 to 39lbs. This balance like yours has a 1-3/32" shoe. Close up view of the S385 balance shoe.
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