Window parts

A home owner from Leonard, MI says:
It says 21HD and then small print bsi jl.
Length is 22"
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Tom from SWISCO responded:

Your balance looks similar in design to our S770-22. The only strange part is the stamp; an "HD" stamp is very uncommon for this style balance. While I am confident that our S770-22 can replace the old assembly, you will need to weigh your sash on a scale and refer to the chart we show on that store page to verify the best stamp option.

How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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