Rail

Hello,

Your photos resemble the S377-17 channel balance at first glance. Your stamp code would correspond to the 1640 strength option to support a sash between 14-19 lbs. Look over the specifications shown on our product page to confirm they match your assembly. Thanks for posting! 

Close up view of the S377 balance top.

Close up view of the S377 balance shoe.

We are not able to process orders through this thread but you are welcome to purchase these stock balances directly on our website or by giving our customer service team a call at (888) 991-1929. Just let us know if you need anything else.