Your window glass should have a LOF (Libby-Owens-Ford) logo along with "Safety Plate" and with a etched date code indicating month & year that the glass was manufactured. For example, the glass date code for my February '72 built coupe is "XY" and my April '72 built convertible is "GY". Also, there should be a a "AS1" stamp on the windshield and the side windows and rear glass should have a "AS2" stamp. These are the clarity and type of glass codes. Also, the side windows should have a etched stamp reading "Safety Flo Lite" and a white silk screened "Astro Ventilation".
The term "Soft Ray" or "Soft Ray Tinted" was used on earlier Corvette models window glass, being phased out around 1968-1969 or so if I'm remembering correctly.
HTH