27 inch channel balance

Thanks for posting. This looks like either an S380-27 or S385-27 Channel Balance. The only difference between these two balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the diagram below for an explanation. Measure the depth of your old balance's shoe to determine which you need. For a stamp option choose 2650.

Comparison of the S378, S380 and S385 balance shoes.