A handy person from Ohio says:
March 24, 2016
I need two balancers for the same Andersen window. Here is a picture of the markings. Can you tell me what to order?
A/W Andersen Corp. BAYPORT MINN 11600-17 927
Donna from SWISCO responded:
March 25, 2016
Hello! I believe the key number here is "927," based on your helpful picture. I would recommend our 23-939 Andersen sash balance, which can replace Andersen balances with this stamp.