17-1 window channel blocks

Thanks for posting. This might be either an S380-18, S385-18, or S378-18. The only difference between these three 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 any case, for a stamp option choose 1710.

Comparison of the S378, S380 and S385 balance shoes.