Single Slide Window with 2 balances
A quick learner from Phoenix Arizona says:
June 5, 2016
The only Identification I see on the main rail which is 26.5 inches is 25-3 GI5 CMC 50
Paul from SWISCO responded:
June 7, 2016
This looks like our Series 385 channel balance. Can you just confirm the length of the metal channel? It should just be 26", based on your stamp. If it is 26.5, then it will have to be custom made. We will need to know the weight of your sash and how many you are looking for.