Older steel door and lock, late 70's/early 80's. On the outside plate on top is the word "PADO" and on the bottom is "LATAO". To me, it looks similar to the
40-049, and this is the only site I seen that has these similar locksets. The newer mortise locksets have wider plates that simply will not fit because of the window frames. Screw to screw on the handle plates is 6 11/16" and screw to screw on the outside plate 6 15/16".