Anderson sash balance #1131 or U70 1093 or 1083 or 11600 17
A professional from Jamestown, CA says:
November 4, 2020
Difficult to read the numbers that are stamped on the balance. We believe that we have listed all numbers. Windows are about 35-40 years old, if that helps.
Bob from SWISCO responded:
November 6, 2020
Check out 24-1133. This is meant to replace Andersen balances that include the stamp code 1131.