Paul from SWISCO responded:
October 12, 2015
I agree, this looks like our Series 380 channel balance. The shoe is a little different but that shouldn't matter too much. It's close enough that you should just make sure the size is the same. Both 15-005 and 19-005 are attached before shipping. Your stamp corresponds to our 2830 option, but you can always weigh your sash to confirm.
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