Part Number 11600A-3
A quick learner from Jane Lew, WV says:
July 12, 2016
Looking for replacement window sash balances.
Tom from SWISCO responded:
July 14, 2016
I'm afraid I'm having trouble making out the stamps in your pictures, as they are very small. Can you tell me what every number printed on the balance box reads? "11600A-3" is not used for identification, but I'm confident one of the other stamps are. It would be easiest just to tell us everything printed, or show us a clear picture of them all.