The car I just bought I was worried about it too, was going to put clear tint film on, was cleaning some and found the marks,-- "as1", and can see the edge ,2layers of glass with plastic in center , I have safely glass in the 17 I just got
Take it to a local glass shop (not franchise) and have them check it.
The State Policeman in charge of inspections, a sergeant, for this area of Virginia told me that the windshield on my speedster was not safety glass. I took it to a local glass shop for replacement, they took a quick look and told me that what I had was safety glass.
I have tried that lighter thing next to the thick plate glass used in the early cars like T's, and saw two reflections. The only two self tests I would trust; edge delamanaton (bubbles between the two) and looking at the raw edges.