Acorn window channel balance

A handy person from jensen beach, florida says:
channel balance for acorn single hung non tilt. 1981. 29" not including shoe or top. 3/8" wide.280 stamp on metal. also needs 1 1/4 + inch flat clips to insert in window frame. The number 28C is stamped on channel not 280 as I previously noted. Also BS1 BV is stamped
A handy person from jensen beach, florida says:
hope photos are clear enough
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. This appears to match our S810-29 channel balance. Check it out and see if you agree. The flat clip you mention very well may be our 16-002. See what you think.
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