Channel Balance Help

Thanks for posting. This looks like what we call 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 reference. Compare both with your old hardware to see what matches best. In either case, for a new stamp option choose 2640. 

Comparison of the S378, S380 and S385 balance shoes.