31 inch channel

A home owner from California says:
August 1, 2022
I think there is a faint 60 as the first marking on the channel. There are no other markings or engravings on the channels. I need this info asap, I will try and call. Thank you.
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31" Series 380 Channel Balance
31" Series 380 Channel Balance
S380-31
$11.30
31" Series 385 Channel Balance
31" Series 385 Channel Balance
S385-31
$11.30
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