Need AMSCO 27in balancing springs

Thanks for posting. Start by looking at either our S380-27 or S385-27. The only difference between these two balances is the depth of the bottom nylon shoe, or the measurement from heel to toe. See the illustration below for reference. Compare both with your old hardware to see what matches best. In either case for a stamp option go with 2640.

Comparison of the S378, S380 and S385 balance shoes.