Tom from SWISCO responded:
February 14, 2018
This balance is a Series 380 or Series 385 channel balance. Take a look at the attachments and see which matches. If you have the 1" attachment shown on bottom, you need Series 380, and if you have the 1-3/32" bottom attachment, you need Series 385. If your metal bar measures 23" inches (measure it) then you can use S380-23 or S385-23. You'd weigh your window sash to choose a weight option, paying particularly close attention to the "2240" option that seems pretty similar to your "22 4" stamp.
Comparison of 15-004 and 15-005
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