Paul from SWISCO responded:
September 9, 2016
Thanks for contacting us. I'm afraid I cannot quite make out what Series balance it is you have. The stamp only tells us how strong the spring is. Capitol often uses our Series 370 channel balance, but you will need to carefully look it over and see how well it matches up. Without the end "caps," we cannot be 100% sure that this balance is what you have.
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