can not find any info on the existing hardware

A home owner from Camden says:
Please help me to identify the part catalog number I need to order. Thank you!
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
The pivot shoe looks okay, but the coil spring is broken. It's our Series 150, so look for a letter or number stamped on it. The number corresponds to the weight that the coil carries, so you'll want to choose the same number as your old coil when you go to order.
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