Wat size balance do I need.

I'm wondering if the "S" in your stamped number is actually a number "5". Take another look at your balance to see if it actually is reading "23 5". If it is, then you would choose stamped option "2350" which holds a sash weight range of 23-27 pounds. If the stamped marking actually reads what you are saying, the best way to decide which stamped option to choose would be to weigh the actual sash.