Coil Balance springs

A handy person from philadelphia says:
October 29, 2019
I AM TRYING TO FIGURE out which coil to get, there are no numbers stamped anywhere, its a double hung double pane glass overall dimension 38x69", not sure which weight i need to get
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Bob from SWISCO responded:
November 1, 2019

Thanks for writing in. This looks like our 15-180 Pivot Shoe. This shoe is compatible with our Series 190 Coil Balances. Let us know if you have any other questions. 
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
Double Support Detent Clip
Double Support Detent Clip
15-181
$6.17
Balance Bushing
Balance Bushing
15-182
$1.80
#8 x 1/2" Truss Head Stainless Steel Phillips Screw
#8 x 1/2" Truss Head Stainless Steel Phillips Screw
33-073
$0.23
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