NON-TILT WINDOW CHANNEL BALANCES - stamped "31 3 Caldwell JM"

A quick learner from Brooklyn, NY says:
HI,
I need to purchase 2 (right and left - seem identical)
NON-TILT WINDOW CHANNEL BALANCES
- stamped "31 3 Caldwell JM"

it actually measures 32", and approx. 1/2" width (33" with hardware attached)

The window is not stamped with manufacturer - from a new home since 1993 (23 years old)
Thanks,
Mike
User submitted photos of a window balance.
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Paul from SWISCO responded:
Hey, Mike. Please look at our S390-32 channel balance, I think you'll find this is a good match. Let me know what you think!
A quick learner from Brooklyn, NY says:
Paul - Thank you so much for the clear directions - I just placed an order for 2 pieces.
Thank again,
A quick learner from Brooklyn, NY says:
I just placed an order for the 2 I need now - is this common available stock? - or should I stock extras for my other windows - for the future??

Thanks again Paul
(Please rush my balances - I'm hoping to receive them before it starts raining :)
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Paul from SWISCO responded:
Thank you for the order! We appreciate it. The Series 390 is pretty common. It's never a bad idea to have extras on hand, but should you need to purchase from us again in a pinch I'm confident we'd be able to accommodate you.
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