27 5 CX CMC 7

Thanks for posting. This looks like it might be either the S380-28 or S385-28. 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 2750.

Comparison of the S378, S380 and S385 balance shoes.