1960 awning lever 19 inches wide

I've seen this older style operator a few times in the past. I'm afraid it's not made anymore. They now make the 39-069 as a replacement, but I'm not sure if it will fit in your window sill the same way. The base is a little shorter than yours. That said, it's also probably going to be your only choice. Look it over and let me know what you think.