23 9 FS Caldwell replacement

A quick learner from Vero Beach, Fl says:
determined that the replacement balance I need is the 24" series 395 channel code:S395-24. My question is the old balance has 23 9 FS CALDWELL stamped on it, and I need to know what weight to pick. Thanks in advance
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Tom from SWISCO responded:
Stamps ending in "9" use an old designation system that has since fallen out of use. One of our standard options may still work, but you will have to weigh your sash on a scale and refer to the chart shown on the S395-24 store page to confirm the best match.
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