Stamped number doesn't match

A handy person from Palm Coast, FL says:
January 12, 2023
The stamp on the channel balance I have is UB 28D. Can you cross reference this to your numbers?
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Emily from SWISCO responded:
January 13, 2023

Hello!

If you have the S380-29, you would want the 2840 spring strength option based on your 28D stamp. Let us know if you have any additional questions!
A handy person from Palm Coast, FL says:
January 13, 2023
Thanks!
29" Series 380 Channel Balance
29" Series 380 Channel Balance
S380-29
$11.10
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