A quick learner from Roseville, CA says:
October 11, 2015
Need to find replacements balance for my window. One window had the stamp on it, but both balances of this one doesn't.
Paul from SWISCO responded:
October 13, 2015
Thanks for posting. I think this could be a match for our S350-28 channel balance. I would also recommend the 2740 option. Just confirm that the nylon caps on each end are the same size.