What option for my Channel Balance

A home owner from Highland Ca says:
I have 28" long 1/2" width (actual dimensions) channel balance stamped 27 3 BSI oc. Im not sure what the sash weight is. Can you help me out? Thanks
User submitted a photo of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
With a stamp like 27 3, I would recommend our 2730 option. This can carry a window sash weight of 13 through 19 pounds. You may want to weigh your sash just to be sure that's accurate.
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