2640

Thanks for posting. It appears both attachments on the balance lack 'wings' or side tabs. Is that correct? If so, this is either an S351-27 or S390-27. The only difference between these two 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. For a stamp option, choose 2640.

Comparison of the S351 and S390 balance shoes.