Thanks. After closer inspection, I found that my other windows appear original PPG, all dated close to each other. *Driver door 26 19, Passenger Door 26 29, Passenger rear 27 29, Backlight 26 19) but the driver rear side window is the lone tinted LOF dated TV. It is my guess that the windshield was replaced in the early 70s, and the drivers rear side was replace by glass from a salvage yard at some point.
So now I think my best option is a repop windshield that is date coded to match, and later a new drivers rear side that is untinted and date matched.