Casey from SWISCO responded:
April 10, 2024
Hello, We can't be sure with your hardware still installed but what I can make out resembles the 15-087, which uses the Series 180 coil springs. You'll need to remove the coils to locate the stamps that correspond to our S180 strength options. We'll also related the accessories used with this coil balance to compare to your hardware. Thanks for posting! Detail of 15-087
Series 180 coil balance diagram
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