Block and Tackle Sash Balance

Hello. We may be able to help, but that stamp is not an identifier. It just tells us the strength of the channel balance. Please remove the balance and send us photos of the nylon attachments on both ends. We'll do our best to help from there.

Thanks for getting back to me. This looks like either an S380-26 or S385-26. The only difference between these balances is the shoe depth. See below. Measure your old balance's shoe depth to see what matches best. In any case, for a stamp option choose 2530.

Comparison of the S378, S380 and S385 balance shoes.