2940 BSI

Hello there. I believe this might be the S378-30, or perhaps the S380-30. The only difference between these channel balances is the 'depth' of the bottom nylon shoe, or the 'heel-to-toe' measurement. See below. Measure your old balance's shoe depth to see what matches best. In either case, for a stamp option choose 2940.

Comparison of the S378, S380 and S385 balance shoes.