Coil Balance springs

A handy person from philadelphia says:
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:

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. 

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