Window Manufacturer - Anyone recognize this window?
You may very well be looking till doomsday trying to find repair parts for old broken windows. And even if you do find parts you will still be left with some thirty five or forty year old window.  

You will likely be better off looking at ripping out the remnants of the window and replacing it with something new that is double or triple glazed in an all vinyl frame that will provide much better energy efficiency than the old unit ever did. 

Measure carefully and study replacement type window styles that will install easily. Most windows like this are custom made to size.