24 inch balance

Thanks for posting. This looks like either an S380-24 or S385-24. The only difference between these two channel balances is the 'depth' of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the diagram below. Measure your old balance's shoe depth to see what matches best. For a stamp option see 2320.

Comparison of the S378, S380 and S385 balance shoes.