window channel balance

Thanks for posting. I believe this is either a S380-14 or S385-14 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. Compare both with your old balance to see what matches best. In either case, for a stamp option choose 1340.

Comparison of the S378, S380 and S385 balance shoes.