26 5 AX CMC 11

Thanks for posting. This is most likely either an S380-27 or S385-27 Channel Balance. The only difference between these two balances is the 'depth' of the bottom nylon shoe. See below. Measure your old balance's shoe to see what matches best. For a stamp option choose 2650.

Comparison of the S378, S380 and S385 balance shoes.