which window balance? 29 6 JW CMC 11

A home owner from Florida says:
Balance Length (metal part): 30 inches
-Markings on Balance: 29 6 JW CMC 11
-Weight of sash: 30 LBS (when I hold it in my hands while on scale)
32 LBS when I put sash on scale by itself
User submitted photos of their 29 6 JW CMC 11 channel balance attachments.
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Mike from SWISCO responded:
It looks like you have the Swisco S385-30 Channel Balance with the stamp option 2950, which would support a sash weight of 30-32 lbs.
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