Tom from SWISCO responded:
June 16, 2017
I've received your pictures, but I'm having trouble making out what you have. Can you show me a clear and close up picture of the nylon caps on either end, as well as the metal clip at the end of the spring? Finally, is there a stamp printed on the balance? If not, we will need to know the weight of the sash.
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Tom from SWISCO responded:
June 21, 2017
Thank you. Let us know whenever you can.
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Tom from SWISCO responded:
June 30, 2017
Thanks. I believe you have either our Series 351 or Series 390 depending on the size of the bottom shoe. I can't tell from your pictures what the bottom shoe size is, but that's the only difference between the two balances I mentioned.
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