window balance, milgard windows, product marking "29 4 JR CALDWELL"

Thanks for posting. See our S380-30 or S385-30. The only difference between these two channel balances is the depth of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the illustration below. Compare both balances with your old hardware to see what matches best. For a new stamp option choose 2940.

Comparison of the S378, S380 and S385 balance shoes.