Please identify 26 4 CALDWELL IM channel balance

A home owner from Glendale , Arizona says:
Please help with identity for replacement.
Stamp is "26 4 CALDWELL IM" Lenght of metal channel is 27",
Width is 1/2" inside. I am attatching photo of ends. Thank you..Dennis
customer uploaded images of channel balances
Profile picture of Donna
Donna from SWISCO responded:
Hi Dennis,

Thank you for posting images.

The balance attachments look like SWISCO products 15-004 & 19-005 which is our series 385 replacement balance.

The stamp 26 4 for a 27" balance normally translates to 2640, this will carry a window sash weight range of 19 through 26 pounds.

See our S385-27 with the option 2640.
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