Pivot lock

A home owner from Canton ohio says:
March 27, 2021
Cannot find any manufacturer or part number length is 2.5 inch.width 1.25 inch.thick=.5 inch there is a 5k on coil .no manufacturer on window either.?
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Bob from SWISCO responded:
March 30, 2021

This looks like a 15-175 Pivot Shoe. This shoe uses Series 152 Coil Balances, and a stamp of 5 indicates you need the S152-5 5 pound spring. Let me know if you have any further questions. 
Coil Balance Shoe, Slate Blue
Coil Balance Shoe, Slate Blue
15-177
$3.47
5 lb Series 152 Coil Balance
5 lb Series 152 Coil Balance
S152-5
$4.80
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