SWISCO - The Replacement Hardware Authority

Help identifying Sash channel

A quick learner from San Jose CA says:
The last image is not clear - my apologies. The text on the channel is: "27 4 Caldwell". I can't find anything else on inside or outside.

The length is 28" (yes 28 not 27)! It is 1/2" wide and 5/8" deep.

Kindly help to identify replacement channels.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. Please see our S385-28, this looks to be a good match.
A quick learner from San Jose CA says:
Great! I am ordering 6 channels and top sash cams. I'll post back with it installed with a follow up, if any.

Thanks for your help and prompt response, @Tom. Much appreciated!
A quick learner from San Jose CA says:
I just noticed that the top shoe on S385 these has wings. But mine does not. I wonder if S350 might be closer to mine. Do you mind having another look at a photos to help confirm, please?
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Ah, I see. If your top attachment has no shoes, then you're right, the Series 350 would be a better match. I apologize for the confusion!
A quick learner from SJC says:
No worries, all's good. Even though I had ordered S385 the nice folks at customer service helped me to change the order. Thanks for confirming it though, I appreciate it.

Best,
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